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Finding the Fourth Proportional to 521.76, 781.98 and 196.80

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Solution

The fourth proportional to 521.76, 781.98 and 196.80 is: 294.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.76 : 781.98 = 196.80 : x
  2. Step 2: Convert to fraction form
    521.76/781.98 = 196.80/x
  3. Step 3: Cross multiply
    521.76x = 781.98 × 196.80
  4. Step 4: Simplify right side
    521.76x = 153,893.66
  5. Step 5: Solve for x
    x = 153,893.66/521.76
  6. Step 6: Final answer
    x = 294.95

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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.