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Finding the Fourth Proportional to 372.12, 558.12 and 128.62

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Solution

The fourth proportional to 372.12, 558.12 and 128.62 is: 192.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.12 : 558.12 = 128.62 : x
  2. Step 2: Convert to fraction form
    372.12/558.12 = 128.62/x
  3. Step 3: Cross multiply
    372.12x = 558.12 × 128.62
  4. Step 4: Simplify right side
    372.12x = 71,785.39
  5. Step 5: Solve for x
    x = 71,785.39/372.12
  6. Step 6: Final answer
    x = 192.91

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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.