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Finding the Fourth Proportional to 521.38, 782.21 and 196.71

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Solution

The fourth proportional to 521.38, 782.21 and 196.71 is: 295.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.38 : 782.21 = 196.71 : x
  2. Step 2: Convert to fraction form
    521.38/782.21 = 196.71/x
  3. Step 3: Cross multiply
    521.38x = 782.21 × 196.71
  4. Step 4: Simplify right side
    521.38x = 153,868.53
  5. Step 5: Solve for x
    x = 153,868.53/521.38
  6. Step 6: Final answer
    x = 295.12

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Double scale
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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.