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Finding the Fourth Proportional to 363,388.92, 545,119.71 and 138,938.19

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Solution

The fourth proportional to 363,388.92, 545,119.71 and 138,938.19 is: 208,421.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    363,388.92 : 545,119.71 = 138,938.19 : x
  2. Step 2: Convert to fraction form
    363,388.92/545,119.71 = 138,938.19/x
  3. Step 3: Cross multiply
    363,388.92x = 545,119.71 × 138,938.19
  4. Step 4: Simplify right side
    363,388.92x = 75,737,945,840.72
  5. Step 5: Solve for x
    x = 75,737,945,840.72/363,388.92
  6. Step 6: Final answer
    x = 208,421.18

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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.