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Finding the Fourth Proportional to 521.49, 781.99 and 156.18

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Solution

The fourth proportional to 521.49, 781.99 and 156.18 is: 234.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.49 : 781.99 = 156.18 : x
  2. Step 2: Convert to fraction form
    521.49/781.99 = 156.18/x
  3. Step 3: Cross multiply
    521.49x = 781.99 × 156.18
  4. Step 4: Simplify right side
    521.49x = 122,131.20
  5. Step 5: Solve for x
    x = 122,131.20/521.49
  6. Step 6: Final answer
    x = 234.20

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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.