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Finding the Fourth Proportional to 425.60, 638.40 and 371.60

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Solution

The fourth proportional to 425.60, 638.40 and 371.60 is: 557.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.60 : 638.40 = 371.60 : x
  2. Step 2: Convert to fraction form
    425.60/638.40 = 371.60/x
  3. Step 3: Cross multiply
    425.60x = 638.40 × 371.60
  4. Step 4: Simplify right side
    425.60x = 237,229.44
  5. Step 5: Solve for x
    x = 237,229.44/425.60
  6. Step 6: Final answer
    x = 557.40

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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.