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Finding the Fourth Proportional to 91.19, 125.55 and 81.34

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Solution

The fourth proportional to 91.19, 125.55 and 81.34 is: 111.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.19 : 125.55 = 81.34 : x
  2. Step 2: Convert to fraction form
    91.19/125.55 = 81.34/x
  3. Step 3: Cross multiply
    91.19x = 125.55 × 81.34
  4. Step 4: Simplify right side
    91.19x = 10,212.24
  5. Step 5: Solve for x
    x = 10,212.24/91.19
  6. Step 6: Final answer
    x = 111.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.