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Finding the Fourth Proportional to 458.30, 632.24 and 318.74

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Solution

The fourth proportional to 458.30, 632.24 and 318.74 is: 439.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.30 : 632.24 = 318.74 : x
  2. Step 2: Convert to fraction form
    458.30/632.24 = 318.74/x
  3. Step 3: Cross multiply
    458.30x = 632.24 × 318.74
  4. Step 4: Simplify right side
    458.30x = 201,515.42
  5. Step 5: Solve for x
    x = 201,515.42/458.30
  6. Step 6: Final answer
    x = 439.71

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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.