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Finding the Fourth Proportional to 108.98, 149.78 and 88.22

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Solution

The fourth proportional to 108.98, 149.78 and 88.22 is: 121.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.98 : 149.78 = 88.22 : x
  2. Step 2: Convert to fraction form
    108.98/149.78 = 88.22/x
  3. Step 3: Cross multiply
    108.98x = 149.78 × 88.22
  4. Step 4: Simplify right side
    108.98x = 13,213.59
  5. Step 5: Solve for x
    x = 13,213.59/108.98
  6. Step 6: Final answer
    x = 121.25

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.