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Finding the Fourth Proportional to 372.15, 557.91 and 140.91

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Solution

The fourth proportional to 372.15, 557.91 and 140.91 is: 211.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.15 : 557.91 = 140.91 : x
  2. Step 2: Convert to fraction form
    372.15/557.91 = 140.91/x
  3. Step 3: Cross multiply
    372.15x = 557.91 × 140.91
  4. Step 4: Simplify right side
    372.15x = 78,616.14
  5. Step 5: Solve for x
    x = 78,616.14/372.15
  6. Step 6: Final answer
    x = 211.25

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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.