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Finding the Fourth Proportional to 458.28, 632.46 and 261.78

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Solution

The fourth proportional to 458.28, 632.46 and 261.78 is: 361.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.28 : 632.46 = 261.78 : x
  2. Step 2: Convert to fraction form
    458.28/632.46 = 261.78/x
  3. Step 3: Cross multiply
    458.28x = 632.46 × 261.78
  4. Step 4: Simplify right side
    458.28x = 165,565.38
  5. Step 5: Solve for x
    x = 165,565.38/458.28
  6. Step 6: Final answer
    x = 361.28

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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.