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Finding the Fourth Proportional to 99.15, 149.25 and 84.29

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Solution

The fourth proportional to 99.15, 149.25 and 84.29 is: 126.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.15 : 149.25 = 84.29 : x
  2. Step 2: Convert to fraction form
    99.15/149.25 = 84.29/x
  3. Step 3: Cross multiply
    99.15x = 149.25 × 84.29
  4. Step 4: Simplify right side
    99.15x = 12,580.22
  5. Step 5: Solve for x
    x = 12,580.22/99.15
  6. Step 6: Final answer
    x = 126.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.