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Finding the Fourth Proportional to 261,390.62, 391,721.00 and 141,188.43

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Solution

The fourth proportional to 261,390.62, 391,721.00 and 141,188.43 is: 211,585.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,390.62 : 391,721.00 = 141,188.43 : x
  2. Step 2: Convert to fraction form
    261,390.62/391,721.00 = 141,188.43/x
  3. Step 3: Cross multiply
    261,390.62x = 391,721.00 × 141,188.43
  4. Step 4: Simplify right side
    261,390.62x = 55,306,473,751.04
  5. Step 5: Solve for x
    x = 55,306,473,751.04/261,390.62
  6. Step 6: Final answer
    x = 211,585.53

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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.