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Finding the Fourth Proportional to 137.98, 206.96 and 40.48

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Solution

The fourth proportional to 137.98, 206.96 and 40.48 is: 60.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.98 : 206.96 = 40.48 : x
  2. Step 2: Convert to fraction form
    137.98/206.96 = 40.48/x
  3. Step 3: Cross multiply
    137.98x = 206.96 × 40.48
  4. Step 4: Simplify right side
    137.98x = 8,377.74
  5. Step 5: Solve for x
    x = 8,377.74/137.98
  6. Step 6: Final answer
    x = 60.72

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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.