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Finding the Fourth Proportional to 425.89, 638.88 and 318.36

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Solution

The fourth proportional to 425.89, 638.88 and 318.36 is: 477.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.89 : 638.88 = 318.36 : x
  2. Step 2: Convert to fraction form
    425.89/638.88 = 318.36/x
  3. Step 3: Cross multiply
    425.89x = 638.88 × 318.36
  4. Step 4: Simplify right side
    425.89x = 203,392.25
  5. Step 5: Solve for x
    x = 203,392.25/425.89
  6. Step 6: Final answer
    x = 477.58

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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.