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Finding the Fourth Proportional to 637.28, 879.68 and 479.68

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Solution

The fourth proportional to 637.28, 879.68 and 479.68 is: 662.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.28 : 879.68 = 479.68 : x
  2. Step 2: Convert to fraction form
    637.28/879.68 = 479.68/x
  3. Step 3: Cross multiply
    637.28x = 879.68 × 479.68
  4. Step 4: Simplify right side
    637.28x = 421,964.90
  5. Step 5: Solve for x
    x = 421,964.90/637.28
  6. Step 6: Final answer
    x = 662.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.