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Finding the Fourth Proportional to 138,379.92, 207,570.08 and 38,540.40

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Solution

The fourth proportional to 138,379.92, 207,570.08 and 38,540.40 is: 57,810.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,379.92 : 207,570.08 = 38,540.40 : x
  2. Step 2: Convert to fraction form
    138,379.92/207,570.08 = 38,540.40/x
  3. Step 3: Cross multiply
    138,379.92x = 207,570.08 × 38,540.40
  4. Step 4: Simplify right side
    138,379.92x = 7,999,833,911.23
  5. Step 5: Solve for x
    x = 7,999,833,911.23/138,379.92
  6. Step 6: Final answer
    x = 57,810.66

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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.