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Finding the Fourth Proportional to 261,212.91, 391,875.75 and 81,294.80

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Solution

The fourth proportional to 261,212.91, 391,875.75 and 81,294.80 is: 121,959.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,212.91 : 391,875.75 = 81,294.80 : x
  2. Step 2: Convert to fraction form
    261,212.91/391,875.75 = 81,294.80/x
  3. Step 3: Cross multiply
    261,212.91x = 391,875.75 × 81,294.80
  4. Step 4: Simplify right side
    261,212.91x = 31,857,458,761.72
  5. Step 5: Solve for x
    x = 31,857,458,761.72/261,212.91
  6. Step 6: Final answer
    x = 121,959.74

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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.