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Finding the Fourth Proportional to 103.19, 154.61 and 91.80

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Solution

The fourth proportional to 103.19, 154.61 and 91.80 is: 137.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.19 : 154.61 = 91.80 : x
  2. Step 2: Convert to fraction form
    103.19/154.61 = 91.80/x
  3. Step 3: Cross multiply
    103.19x = 154.61 × 91.80
  4. Step 4: Simplify right side
    103.19x = 14,193.08
  5. Step 5: Solve for x
    x = 14,193.08/103.19
  6. Step 6: Final answer
    x = 137.54

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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.