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Finding the Fourth Proportional to 261,141.90, 391,711.11 and 126,048.28

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Solution

The fourth proportional to 261,141.90, 391,711.11 and 126,048.28 is: 189,071.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,141.90 : 391,711.11 = 126,048.28 : x
  2. Step 2: Convert to fraction form
    261,141.90/391,711.11 = 126,048.28/x
  3. Step 3: Cross multiply
    261,141.90x = 391,711.11 × 126,048.28
  4. Step 4: Simplify right side
    261,141.90x = 49,374,511,746.57
  5. Step 5: Solve for x
    x = 49,374,511,746.57/261,141.90
  6. Step 6: Final answer
    x = 189,071.58

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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.