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Finding the Fourth Proportional to 423.38, 584.02 and 318.43

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Solution

The fourth proportional to 423.38, 584.02 and 318.43 is: 439.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.38 : 584.02 = 318.43 : x
  2. Step 2: Convert to fraction form
    423.38/584.02 = 318.43/x
  3. Step 3: Cross multiply
    423.38x = 584.02 × 318.43
  4. Step 4: Simplify right side
    423.38x = 185,966.57
  5. Step 5: Solve for x
    x = 185,966.57/423.38
  6. Step 6: Final answer
    x = 439.25

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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.