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Finding the Fourth Proportional to 372.42, 558.63 and 138.17

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Solution

The fourth proportional to 372.42, 558.63 and 138.17 is: 207.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.42 : 558.63 = 138.17 : x
  2. Step 2: Convert to fraction form
    372.42/558.63 = 138.17/x
  3. Step 3: Cross multiply
    372.42x = 558.63 × 138.17
  4. Step 4: Simplify right side
    372.42x = 77,183.11
  5. Step 5: Solve for x
    x = 77,183.11/372.42
  6. Step 6: Final answer
    x = 207.25

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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.