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Finding the Fourth Proportional to 521.26, 781.78 and 155.95

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Solution

The fourth proportional to 521.26, 781.78 and 155.95 is: 233.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.26 : 781.78 = 155.95 : x
  2. Step 2: Convert to fraction form
    521.26/781.78 = 155.95/x
  3. Step 3: Cross multiply
    521.26x = 781.78 × 155.95
  4. Step 4: Simplify right side
    521.26x = 121,918.59
  5. Step 5: Solve for x
    x = 121,918.59/521.26
  6. Step 6: Final answer
    x = 233.89

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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.