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Finding the Fourth Proportional to 424.06, 639.48 and 418.28

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Solution

The fourth proportional to 424.06, 639.48 and 418.28 is: 630.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.06 : 639.48 = 418.28 : x
  2. Step 2: Convert to fraction form
    424.06/639.48 = 418.28/x
  3. Step 3: Cross multiply
    424.06x = 639.48 × 418.28
  4. Step 4: Simplify right side
    424.06x = 267,481.69
  5. Step 5: Solve for x
    x = 267,481.69/424.06
  6. Step 6: Final answer
    x = 630.76

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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.