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Finding the Fourth Proportional to 462.72, 693.99 and 138.15

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Solution

The fourth proportional to 462.72, 693.99 and 138.15 is: 207.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.72 : 693.99 = 138.15 : x
  2. Step 2: Convert to fraction form
    462.72/693.99 = 138.15/x
  3. Step 3: Cross multiply
    462.72x = 693.99 × 138.15
  4. Step 4: Simplify right side
    462.72x = 95,874.72
  5. Step 5: Solve for x
    x = 95,874.72/462.72
  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.