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Finding the Fourth Proportional to 425.64, 638.30 and 137

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Solution

The fourth proportional to 425.64, 638.30 and 137 is: 205.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.64 : 638.30 = 137 : x
  2. Step 2: Convert to fraction form
    425.64/638.30 = 137/x
  3. Step 3: Cross multiply
    425.64x = 638.30 × 137
  4. Step 4: Simplify right side
    425.64x = 87,447.10
  5. Step 5: Solve for x
    x = 87,447.10/425.64
  6. Step 6: Final answer
    x = 205.45

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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.