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Finding the Fourth Proportional to 372.15, 558.23 and 128.85

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Solution

The fourth proportional to 372.15, 558.23 and 128.85 is: 193.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.15 : 558.23 = 128.85 : x
  2. Step 2: Convert to fraction form
    372.15/558.23 = 128.85/x
  3. Step 3: Cross multiply
    372.15x = 558.23 × 128.85
  4. Step 4: Simplify right side
    372.15x = 71,925.20
  5. Step 5: Solve for x
    x = 71,925.20/372.15
  6. Step 6: Final answer
    x = 193.27

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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.