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Finding the Fourth Proportional to 100.36, 150.55 and 81.22

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Solution

The fourth proportional to 100.36, 150.55 and 81.22 is: 121.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.36 : 150.55 = 81.22 : x
  2. Step 2: Convert to fraction form
    100.36/150.55 = 81.22/x
  3. Step 3: Cross multiply
    100.36x = 150.55 × 81.22
  4. Step 4: Simplify right side
    100.36x = 12,227.67
  5. Step 5: Solve for x
    x = 12,227.67/100.36
  6. Step 6: Final answer
    x = 121.84

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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.