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Finding the Fourth Proportional to 261,240.42, 391,865.48 and 74,256.78

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Solution

The fourth proportional to 261,240.42, 391,865.48 and 74,256.78 is: 111,386.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,240.42 : 391,865.48 = 74,256.78 : x
  2. Step 2: Convert to fraction form
    261,240.42/391,865.48 = 74,256.78/x
  3. Step 3: Cross multiply
    261,240.42x = 391,865.48 × 74,256.78
  4. Step 4: Simplify right side
    261,240.42x = 29,098,668,737.95
  5. Step 5: Solve for x
    x = 29,098,668,737.95/261,240.42
  6. Step 6: Final answer
    x = 111,386.55

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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.