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Finding the Fourth Proportional to 103.11, 154.49 and 74.08

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Solution

The fourth proportional to 103.11, 154.49 and 74.08 is: 110.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.11 : 154.49 = 74.08 : x
  2. Step 2: Convert to fraction form
    103.11/154.49 = 74.08/x
  3. Step 3: Cross multiply
    103.11x = 154.49 × 74.08
  4. Step 4: Simplify right side
    103.11x = 11,444.25
  5. Step 5: Solve for x
    x = 11,444.25/103.11
  6. Step 6: Final answer
    x = 110.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.