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Finding the Fourth Proportional to 18,781.92, 28,158.91 and 11,384.60

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Solution

The fourth proportional to 18,781.92, 28,158.91 and 11,384.60 is: 17,068.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.92 : 28,158.91 = 11,384.60 : x
  2. Step 2: Convert to fraction form
    18,781.92/28,158.91 = 11,384.60/x
  3. Step 3: Cross multiply
    18,781.92x = 28,158.91 × 11,384.60
  4. Step 4: Simplify right side
    18,781.92x = 320,577,757.53
  5. Step 5: Solve for x
    x = 320,577,757.53/18,781.92
  6. Step 6: Final answer
    x = 17,068.42

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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.