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Finding the Fourth Proportional to 521.43, 781.84 and 196.66

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Solution

The fourth proportional to 521.43, 781.84 and 196.66 is: 294.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.43 : 781.84 = 196.66 : x
  2. Step 2: Convert to fraction form
    521.43/781.84 = 196.66/x
  3. Step 3: Cross multiply
    521.43x = 781.84 × 196.66
  4. Step 4: Simplify right side
    521.43x = 153,756.65
  5. Step 5: Solve for x
    x = 153,756.65/521.43
  6. Step 6: Final answer
    x = 294.87

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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.