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Finding the Fourth Proportional to 54,931.20, 82,396.80 and 15,487.80

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Solution

The fourth proportional to 54,931.20, 82,396.80 and 15,487.80 is: 23,231.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,931.20 : 82,396.80 = 15,487.80 : x
  2. Step 2: Convert to fraction form
    54,931.20/82,396.80 = 15,487.80/x
  3. Step 3: Cross multiply
    54,931.20x = 82,396.80 × 15,487.80
  4. Step 4: Simplify right side
    54,931.20x = 1,276,145,159.04
  5. Step 5: Solve for x
    x = 1,276,145,159.04/54,931.20
  6. Step 6: Final answer
    x = 23,231.70

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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.