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Finding the Fourth Proportional to 90.82, 136.40 and 77.22

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Solution

The fourth proportional to 90.82, 136.40 and 77.22 is: 115.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.82 : 136.40 = 77.22 : x
  2. Step 2: Convert to fraction form
    90.82/136.40 = 77.22/x
  3. Step 3: Cross multiply
    90.82x = 136.40 × 77.22
  4. Step 4: Simplify right side
    90.82x = 10,532.81
  5. Step 5: Solve for x
    x = 10,532.81/90.82
  6. Step 6: Final answer
    x = 115.97

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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.