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Finding the Fourth Proportional to 425.71, 638.88 and 317.17

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Solution

The fourth proportional to 425.71, 638.88 and 317.17 is: 475.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.71 : 638.88 = 317.17 : x
  2. Step 2: Convert to fraction form
    425.71/638.88 = 317.17/x
  3. Step 3: Cross multiply
    425.71x = 638.88 × 317.17
  4. Step 4: Simplify right side
    425.71x = 202,633.57
  5. Step 5: Solve for x
    x = 202,633.57/425.71
  6. Step 6: Final answer
    x = 475.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.