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Finding the Fourth Proportional to 372.01, 512.80 and 306.40

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Solution

The fourth proportional to 372.01, 512.80 and 306.40 is: 422.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.01 : 512.80 = 306.40 : x
  2. Step 2: Convert to fraction form
    372.01/512.80 = 306.40/x
  3. Step 3: Cross multiply
    372.01x = 512.80 × 306.40
  4. Step 4: Simplify right side
    372.01x = 157,121.92
  5. Step 5: Solve for x
    x = 157,121.92/372.01
  6. Step 6: Final answer
    x = 422.36

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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.