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Finding the Fourth Proportional to 417.71, 576.49 and 318.25

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Solution

The fourth proportional to 417.71, 576.49 and 318.25 is: 439.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.71 : 576.49 = 318.25 : x
  2. Step 2: Convert to fraction form
    417.71/576.49 = 318.25/x
  3. Step 3: Cross multiply
    417.71x = 576.49 × 318.25
  4. Step 4: Simplify right side
    417.71x = 183,470.98
  5. Step 5: Solve for x
    x = 183,470.98/417.71
  6. Step 6: Final answer
    x = 439.23

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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.