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Finding the Fourth Proportional to 91.72, 125.61 and 90.52

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Solution

The fourth proportional to 91.72, 125.61 and 90.52 is: 123.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.72 : 125.61 = 90.52 : x
  2. Step 2: Convert to fraction form
    91.72/125.61 = 90.52/x
  3. Step 3: Cross multiply
    91.72x = 125.61 × 90.52
  4. Step 4: Simplify right side
    91.72x = 11,370.22
  5. Step 5: Solve for x
    x = 11,370.22/91.72
  6. Step 6: Final answer
    x = 123.97

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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.