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Finding the Fourth Proportional to 869,138.40, 1,217,623.20 and 869,138.40

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Solution

The fourth proportional to 869,138.40, 1,217,623.20 and 869,138.40 is: 1,217,623.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    869,138.40 : 1,217,623.20 = 869,138.40 : x
  2. Step 2: Convert to fraction form
    869,138.40/1,217,623.20 = 869,138.40/x
  3. Step 3: Cross multiply
    869,138.40x = 1,217,623.20 × 869,138.40
  4. Step 4: Simplify right side
    869,138.40x = 1,058,283,079,850.88
  5. Step 5: Solve for x
    x = 1,058,283,079,850.88/869,138.40
  6. Step 6: Final answer
    x = 1,217,623.20

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Double scale
Find fourth proportional to 869,139.40, 1,217,624.60 and 869,139.40
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.