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Finding the Fourth Proportional to 12,991,226.40, 18,217,576.80 and 12,991,226.40

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Solution

The fourth proportional to 12,991,226.40, 18,217,576.80 and 12,991,226.40 is: 18,217,576.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991,226.40 : 18,217,576.80 = 12,991,226.40 : x
  2. Step 2: Convert to fraction form
    12,991,226.40/18,217,576.80 = 12,991,226.40/x
  3. Step 3: Cross multiply
    12,991,226.40x = 18,217,576.80 × 12,991,226.40
  4. Step 4: Simplify right side
    12,991,226.40x = 236,668,664,668,187.53
  5. Step 5: Solve for x
    x = 236,668,664,668,187.53/12,991,226.40
  6. Step 6: Final answer
    x = 18,217,576.80

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.