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Finding the Fourth Proportional to 138,379.42, 207,569.33 and 38,539.90

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Solution

The fourth proportional to 138,379.42, 207,569.33 and 38,539.90 is: 57,809.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,379.42 : 207,569.33 = 38,539.90 : x
  2. Step 2: Convert to fraction form
    138,379.42/207,569.33 = 38,539.90/x
  3. Step 3: Cross multiply
    138,379.42x = 207,569.33 × 38,539.90
  4. Step 4: Simplify right side
    138,379.42x = 7,999,699,990.72
  5. Step 5: Solve for x
    x = 7,999,699,990.72/138,379.42
  6. Step 6: Final answer
    x = 57,809.90

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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.