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Finding the Fourth Proportional to 372.98, 515.22 and 308.28

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Solution

The fourth proportional to 372.98, 515.22 and 308.28 is: 425.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.98 : 515.22 = 308.28 : x
  2. Step 2: Convert to fraction form
    372.98/515.22 = 308.28/x
  3. Step 3: Cross multiply
    372.98x = 515.22 × 308.28
  4. Step 4: Simplify right side
    372.98x = 158,832.02
  5. Step 5: Solve for x
    x = 158,832.02/372.98
  6. Step 6: Final answer
    x = 425.85

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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.