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Finding the Fourth Proportional to 103.74, 154.81 and 91.59

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Solution

The fourth proportional to 103.74, 154.81 and 91.59 is: 136.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.74 : 154.81 = 91.59 : x
  2. Step 2: Convert to fraction form
    103.74/154.81 = 91.59/x
  3. Step 3: Cross multiply
    103.74x = 154.81 × 91.59
  4. Step 4: Simplify right side
    103.74x = 14,179.05
  5. Step 5: Solve for x
    x = 14,179.05/103.74
  6. Step 6: Final answer
    x = 136.68

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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.