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Finding the Fourth Proportional to 521.26, 781.42 and 196.39

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Solution

The fourth proportional to 521.26, 781.42 and 196.39 is: 294.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.26 : 781.42 = 196.39 : x
  2. Step 2: Convert to fraction form
    521.26/781.42 = 196.39/x
  3. Step 3: Cross multiply
    521.26x = 781.42 × 196.39
  4. Step 4: Simplify right side
    521.26x = 153,463.07
  5. Step 5: Solve for x
    x = 153,463.07/521.26
  6. Step 6: Final answer
    x = 294.41

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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.