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Finding the Fourth Proportional to 103.26, 154.90 and 79.14

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Solution

The fourth proportional to 103.26, 154.90 and 79.14 is: 118.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.26 : 154.90 = 79.14 : x
  2. Step 2: Convert to fraction form
    103.26/154.90 = 79.14/x
  3. Step 3: Cross multiply
    103.26x = 154.90 × 79.14
  4. Step 4: Simplify right side
    103.26x = 12,258.79
  5. Step 5: Solve for x
    x = 12,258.79/103.26
  6. Step 6: Final answer
    x = 118.72

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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.