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Finding the Fourth Proportional to 54,487.80, 81,731.70 and 19,428.60

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Solution

The fourth proportional to 54,487.80, 81,731.70 and 19,428.60 is: 29,142.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,487.80 : 81,731.70 = 19,428.60 : x
  2. Step 2: Convert to fraction form
    54,487.80/81,731.70 = 19,428.60/x
  3. Step 3: Cross multiply
    54,487.80x = 81,731.70 × 19,428.60
  4. Step 4: Simplify right side
    54,487.80x = 1,587,932,506.62
  5. Step 5: Solve for x
    x = 1,587,932,506.62/54,487.80
  6. Step 6: Final answer
    x = 29,142.90

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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.