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Finding the Fourth Proportional to 425.25, 637.98 and 136.69

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Solution

The fourth proportional to 425.25, 637.98 and 136.69 is: 205.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.25 : 637.98 = 136.69 : x
  2. Step 2: Convert to fraction form
    425.25/637.98 = 136.69/x
  3. Step 3: Cross multiply
    425.25x = 637.98 × 136.69
  4. Step 4: Simplify right side
    425.25x = 87,203.38
  5. Step 5: Solve for x
    x = 87,203.38/425.25
  6. Step 6: Final answer
    x = 205.06

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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.