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Finding the Fourth Proportional to 372.20, 513.70 and 274.46

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Solution

The fourth proportional to 372.20, 513.70 and 274.46 is: 378.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.20 : 513.70 = 274.46 : x
  2. Step 2: Convert to fraction form
    372.20/513.70 = 274.46/x
  3. Step 3: Cross multiply
    372.20x = 513.70 × 274.46
  4. Step 4: Simplify right side
    372.20x = 140,990.10
  5. Step 5: Solve for x
    x = 140,990.10/372.20
  6. Step 6: Final answer
    x = 378.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.