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Finding the Fourth Proportional to 103.23, 153.92 and 99.18

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Solution

The fourth proportional to 103.23, 153.92 and 99.18 is: 147.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.23 : 153.92 = 99.18 : x
  2. Step 2: Convert to fraction form
    103.23/153.92 = 99.18/x
  3. Step 3: Cross multiply
    103.23x = 153.92 × 99.18
  4. Step 4: Simplify right side
    103.23x = 15,266.03
  5. Step 5: Solve for x
    x = 15,266.03/103.23
  6. Step 6: Final answer
    x = 147.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.