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Finding the Fourth Proportional to 103.06, 153.92 and 89.39

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Solution

The fourth proportional to 103.06, 153.92 and 89.39 is: 133.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.06 : 153.92 = 89.39 : x
  2. Step 2: Convert to fraction form
    103.06/153.92 = 89.39/x
  3. Step 3: Cross multiply
    103.06x = 153.92 × 89.39
  4. Step 4: Simplify right side
    103.06x = 13,759.52
  5. Step 5: Solve for x
    x = 13,759.52/103.06
  6. Step 6: Final answer
    x = 133.51

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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.