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Finding the Fourth Proportional to 100.67, 150.86 and 86.22

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Solution

The fourth proportional to 100.67, 150.86 and 86.22 is: 129.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.67 : 150.86 = 86.22 : x
  2. Step 2: Convert to fraction form
    100.67/150.86 = 86.22/x
  3. Step 3: Cross multiply
    100.67x = 150.86 × 86.22
  4. Step 4: Simplify right side
    100.67x = 13,007.36
  5. Step 5: Solve for x
    x = 13,007.36/100.67
  6. Step 6: Final answer
    x = 129.21

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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.