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Finding the Fourth Proportional to 425.56, 640.87 and 372.08

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Solution

The fourth proportional to 425.56, 640.87 and 372.08 is: 560.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.56 : 640.87 = 372.08 : x
  2. Step 2: Convert to fraction form
    425.56/640.87 = 372.08/x
  3. Step 3: Cross multiply
    425.56x = 640.87 × 372.08
  4. Step 4: Simplify right side
    425.56x = 238,454.91
  5. Step 5: Solve for x
    x = 238,454.91/425.56
  6. Step 6: Final answer
    x = 560.33

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.