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Finding the Fourth Proportional to 424.64, 632.56 and 422.72

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Solution

The fourth proportional to 424.64, 632.56 and 422.72 is: 629.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.64 : 632.56 = 422.72 : x
  2. Step 2: Convert to fraction form
    424.64/632.56 = 422.72/x
  3. Step 3: Cross multiply
    424.64x = 632.56 × 422.72
  4. Step 4: Simplify right side
    424.64x = 267,395.76
  5. Step 5: Solve for x
    x = 267,395.76/424.64
  6. Step 6: Final answer
    x = 629.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.