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Finding the Fourth Proportional to 426.60, 639.76 and 137.97

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Solution

The fourth proportional to 426.60, 639.76 and 137.97 is: 206.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.60 : 639.76 = 137.97 : x
  2. Step 2: Convert to fraction form
    426.60/639.76 = 137.97/x
  3. Step 3: Cross multiply
    426.60x = 639.76 × 137.97
  4. Step 4: Simplify right side
    426.60x = 88,267.69
  5. Step 5: Solve for x
    x = 88,267.69/426.60
  6. Step 6: Final answer
    x = 206.91

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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.