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Finding the Fourth Proportional to 457.79, 631.55 and 318.24

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Solution

The fourth proportional to 457.79, 631.55 and 318.24 is: 439.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.79 : 631.55 = 318.24 : x
  2. Step 2: Convert to fraction form
    457.79/631.55 = 318.24/x
  3. Step 3: Cross multiply
    457.79x = 631.55 × 318.24
  4. Step 4: Simplify right side
    457.79x = 200,984.47
  5. Step 5: Solve for x
    x = 200,984.47/457.79
  6. Step 6: Final answer
    x = 439.03

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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.