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Finding the Fourth Proportional to 18,691.53, 28,005.55 and 11,280.42

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Solution

The fourth proportional to 18,691.53, 28,005.55 and 11,280.42 is: 16,901.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691.53 : 28,005.55 = 11,280.42 : x
  2. Step 2: Convert to fraction form
    18,691.53/28,005.55 = 11,280.42/x
  3. Step 3: Cross multiply
    18,691.53x = 28,005.55 × 11,280.42
  4. Step 4: Simplify right side
    18,691.53x = 315,914,226.30
  5. Step 5: Solve for x
    x = 315,914,226.30/18,691.53
  6. Step 6: Final answer
    x = 16,901.47

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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.