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Finding the Fourth Proportional to 12,491.80, 18,740.40 and 4,170.40

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Solution

The fourth proportional to 12,491.80, 18,740.40 and 4,170.40 is: 6,256.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,491.80 : 18,740.40 = 4,170.40 : x
  2. Step 2: Convert to fraction form
    12,491.80/18,740.40 = 4,170.40/x
  3. Step 3: Cross multiply
    12,491.80x = 18,740.40 × 4,170.40
  4. Step 4: Simplify right side
    12,491.80x = 78,154,964.16
  5. Step 5: Solve for x
    x = 78,154,964.16/12,491.80
  6. Step 6: Final answer
    x = 6,256.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.