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Finding the Fourth Proportional to 457.68, 685.92 and 392.88

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Solution

The fourth proportional to 457.68, 685.92 and 392.88 is: 588.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.68 : 685.92 = 392.88 : x
  2. Step 2: Convert to fraction form
    457.68/685.92 = 392.88/x
  3. Step 3: Cross multiply
    457.68x = 685.92 × 392.88
  4. Step 4: Simplify right side
    457.68x = 269,484.25
  5. Step 5: Solve for x
    x = 269,484.25/457.68
  6. Step 6: Final answer
    x = 588.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.