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Finding the Fourth Proportional to 457.91, 631.72 and 318.37

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Solution

The fourth proportional to 457.91, 631.72 and 318.37 is: 439.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.91 : 631.72 = 318.37 : x
  2. Step 2: Convert to fraction form
    457.91/631.72 = 318.37/x
  3. Step 3: Cross multiply
    457.91x = 631.72 × 318.37
  4. Step 4: Simplify right side
    457.91x = 201,118.32
  5. Step 5: Solve for x
    x = 201,118.32/457.91
  6. Step 6: Final answer
    x = 439.21

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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.