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Finding the Fourth Proportional to 457.91, 631.88 and 280.79

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Solution

The fourth proportional to 457.91, 631.88 and 280.79 is: 387.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.91 : 631.88 = 280.79 : x
  2. Step 2: Convert to fraction form
    457.91/631.88 = 280.79/x
  3. Step 3: Cross multiply
    457.91x = 631.88 × 280.79
  4. Step 4: Simplify right side
    457.91x = 177,421.02
  5. Step 5: Solve for x
    x = 177,421.02/457.91
  6. Step 6: Final answer
    x = 387.46

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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.