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Finding the Fourth Proportional to 261,331.34, 391,902.91 and 90,506.79

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Solution

The fourth proportional to 261,331.34, 391,902.91 and 90,506.79 is: 135,727.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,331.34 : 391,902.91 = 90,506.79 : x
  2. Step 2: Convert to fraction form
    261,331.34/391,902.91 = 90,506.79/x
  3. Step 3: Cross multiply
    261,331.34x = 391,902.91 × 90,506.79
  4. Step 4: Simplify right side
    261,331.34x = 35,469,874,149.49
  5. Step 5: Solve for x
    x = 35,469,874,149.49/261,331.34
  6. Step 6: Final answer
    x = 135,727.60

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1.5x scale

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.