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Finding the Fourth Proportional to 137.42, 206.94 and 99.17

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Solution

The fourth proportional to 137.42, 206.94 and 99.17 is: 149.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.42 : 206.94 = 99.17 : x
  2. Step 2: Convert to fraction form
    137.42/206.94 = 99.17/x
  3. Step 3: Cross multiply
    137.42x = 206.94 × 99.17
  4. Step 4: Simplify right side
    137.42x = 20,521.61
  5. Step 5: Solve for x
    x = 20,521.61/137.42
  6. Step 6: Final answer
    x = 149.33

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.