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Finding the Fourth Proportional to 103.12, 141.54 and 91.60

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Solution

The fourth proportional to 103.12, 141.54 and 91.60 is: 125.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.12 : 141.54 = 91.60 : x
  2. Step 2: Convert to fraction form
    103.12/141.54 = 91.60/x
  3. Step 3: Cross multiply
    103.12x = 141.54 × 91.60
  4. Step 4: Simplify right side
    103.12x = 12,965.06
  5. Step 5: Solve for x
    x = 12,965.06/103.12
  6. Step 6: Final answer
    x = 125.73

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.