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Finding the Fourth Proportional to 91.09, 125.73 and 61.99

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Solution

The fourth proportional to 91.09, 125.73 and 61.99 is: 85.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.09 : 125.73 = 61.99 : x
  2. Step 2: Convert to fraction form
    91.09/125.73 = 61.99/x
  3. Step 3: Cross multiply
    91.09x = 125.73 × 61.99
  4. Step 4: Simplify right side
    91.09x = 7,793.69
  5. Step 5: Solve for x
    x = 7,793.69/91.09
  6. Step 6: Final answer
    x = 85.56

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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.