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Finding the Fourth Proportional to 354.62, 531.79 and 138.17

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Solution

The fourth proportional to 354.62, 531.79 and 138.17 is: 207.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.62 : 531.79 = 138.17 : x
  2. Step 2: Convert to fraction form
    354.62/531.79 = 138.17/x
  3. Step 3: Cross multiply
    354.62x = 531.79 × 138.17
  4. Step 4: Simplify right side
    354.62x = 73,477.42
  5. Step 5: Solve for x
    x = 73,477.42/354.62
  6. Step 6: Final answer
    x = 207.20

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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.