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Finding the Fourth Proportional to 478.28, 659.72 and 426.17

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Solution

The fourth proportional to 478.28, 659.72 and 426.17 is: 587.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.28 : 659.72 = 426.17 : x
  2. Step 2: Convert to fraction form
    478.28/659.72 = 426.17/x
  3. Step 3: Cross multiply
    478.28x = 659.72 × 426.17
  4. Step 4: Simplify right side
    478.28x = 281,147.44
  5. Step 5: Solve for x
    x = 281,147.44/478.28
  6. Step 6: Final answer
    x = 587.84

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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.