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Finding the Fourth Proportional to 103.13, 154.39 and 74.15

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Solution

The fourth proportional to 103.13, 154.39 and 74.15 is: 111.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.13 : 154.39 = 74.15 : x
  2. Step 2: Convert to fraction form
    103.13/154.39 = 74.15/x
  3. Step 3: Cross multiply
    103.13x = 154.39 × 74.15
  4. Step 4: Simplify right side
    103.13x = 11,448.02
  5. Step 5: Solve for x
    x = 11,448.02/103.13
  6. Step 6: Final answer
    x = 111.01

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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.