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Finding the Fourth Proportional to 372.70, 557.70 and 251.20

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Solution

The fourth proportional to 372.70, 557.70 and 251.20 is: 375.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.70 : 557.70 = 251.20 : x
  2. Step 2: Convert to fraction form
    372.70/557.70 = 251.20/x
  3. Step 3: Cross multiply
    372.70x = 557.70 × 251.20
  4. Step 4: Simplify right side
    372.70x = 140,094.24
  5. Step 5: Solve for x
    x = 140,094.24/372.70
  6. Step 6: Final answer
    x = 375.89

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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.