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Finding the Fourth Proportional to 261,458.48, 392,189.45 and 71,938.87

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Solution

The fourth proportional to 261,458.48, 392,189.45 and 71,938.87 is: 107,908.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,458.48 : 392,189.45 = 71,938.87 : x
  2. Step 2: Convert to fraction form
    261,458.48/392,189.45 = 71,938.87/x
  3. Step 3: Cross multiply
    261,458.48x = 392,189.45 × 71,938.87
  4. Step 4: Simplify right side
    261,458.48x = 28,213,665,058.30
  5. Step 5: Solve for x
    x = 28,213,665,058.30/261,458.48
  6. Step 6: Final answer
    x = 107,908.78

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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.