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Finding the Fourth Proportional to 20,641.48, 28,487.10 and 11,691.16

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Solution

The fourth proportional to 20,641.48, 28,487.10 and 11,691.16 is: 16,134.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,641.48 : 28,487.10 = 11,691.16 : x
  2. Step 2: Convert to fraction form
    20,641.48/28,487.10 = 11,691.16/x
  3. Step 3: Cross multiply
    20,641.48x = 28,487.10 × 11,691.16
  4. Step 4: Simplify right side
    20,641.48x = 333,047,244.04
  5. Step 5: Solve for x
    x = 333,047,244.04/20,641.48
  6. Step 6: Final answer
    x = 16,134.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.