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Finding the Fourth Proportional to 111.29, 153.49 and 98.19

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Solution

The fourth proportional to 111.29, 153.49 and 98.19 is: 135.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.29 : 153.49 = 98.19 : x
  2. Step 2: Convert to fraction form
    111.29/153.49 = 98.19/x
  3. Step 3: Cross multiply
    111.29x = 153.49 × 98.19
  4. Step 4: Simplify right side
    111.29x = 15,070.62
  5. Step 5: Solve for x
    x = 15,070.62/111.29
  6. Step 6: Final answer
    x = 135.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.