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Finding the Fourth Proportional to 425.25, 638.31 and 286.41

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Solution

The fourth proportional to 425.25, 638.31 and 286.41 is: 429.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.25 : 638.31 = 286.41 : x
  2. Step 2: Convert to fraction form
    425.25/638.31 = 286.41/x
  3. Step 3: Cross multiply
    425.25x = 638.31 × 286.41
  4. Step 4: Simplify right side
    425.25x = 182,820.76
  5. Step 5: Solve for x
    x = 182,820.76/425.25
  6. Step 6: Final answer
    x = 429.91

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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.