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Finding the Fourth Proportional to 151.19, 226.30 and 81.68

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Solution

The fourth proportional to 151.19, 226.30 and 81.68 is: 122.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.19 : 226.30 = 81.68 : x
  2. Step 2: Convert to fraction form
    151.19/226.30 = 81.68/x
  3. Step 3: Cross multiply
    151.19x = 226.30 × 81.68
  4. Step 4: Simplify right side
    151.19x = 18,484.18
  5. Step 5: Solve for x
    x = 18,484.18/151.19
  6. Step 6: Final answer
    x = 122.26

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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.