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Finding the Fourth Proportional to 426.56, 639.28 and 371.48

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Solution

The fourth proportional to 426.56, 639.28 and 371.48 is: 556.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.56 : 639.28 = 371.48 : x
  2. Step 2: Convert to fraction form
    426.56/639.28 = 371.48/x
  3. Step 3: Cross multiply
    426.56x = 639.28 × 371.48
  4. Step 4: Simplify right side
    426.56x = 237,475.61
  5. Step 5: Solve for x
    x = 237,475.61/426.56
  6. Step 6: Final answer
    x = 556.73

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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.