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Finding the Fourth Proportional to 457.74, 631.94 and 318.29

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Solution

The fourth proportional to 457.74, 631.94 and 318.29 is: 439.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.74 : 631.94 = 318.29 : x
  2. Step 2: Convert to fraction form
    457.74/631.94 = 318.29/x
  3. Step 3: Cross multiply
    457.74x = 631.94 × 318.29
  4. Step 4: Simplify right side
    457.74x = 201,135.43
  5. Step 5: Solve for x
    x = 201,135.43/457.74
  6. Step 6: Final answer
    x = 439.41

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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.