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Finding the Fourth Proportional to 103.35, 154.25 and 91.20

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Solution

The fourth proportional to 103.35, 154.25 and 91.20 is: 136.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.35 : 154.25 = 91.20 : x
  2. Step 2: Convert to fraction form
    103.35/154.25 = 91.20/x
  3. Step 3: Cross multiply
    103.35x = 154.25 × 91.20
  4. Step 4: Simplify right side
    103.35x = 14,067.60
  5. Step 5: Solve for x
    x = 14,067.60/103.35
  6. Step 6: Final answer
    x = 136.12

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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.