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Finding the Fourth Proportional to 38,687.90, 58,053.31 and 20,918.12

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Solution

The fourth proportional to 38,687.90, 58,053.31 and 20,918.12 is: 31,388.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,687.90 : 58,053.31 = 20,918.12 : x
  2. Step 2: Convert to fraction form
    38,687.90/58,053.31 = 20,918.12/x
  3. Step 3: Cross multiply
    38,687.90x = 58,053.31 × 20,918.12
  4. Step 4: Simplify right side
    38,687.90x = 1,214,365,762.42
  5. Step 5: Solve for x
    x = 1,214,365,762.42/38,687.90
  6. Step 6: Final answer
    x = 31,388.78

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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.