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Finding the Fourth Proportional to 91.92, 125.96 and 90.64

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Solution

The fourth proportional to 91.92, 125.96 and 90.64 is: 124.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.92 : 125.96 = 90.64 : x
  2. Step 2: Convert to fraction form
    91.92/125.96 = 90.64/x
  3. Step 3: Cross multiply
    91.92x = 125.96 × 90.64
  4. Step 4: Simplify right side
    91.92x = 11,417.01
  5. Step 5: Solve for x
    x = 11,417.01/91.92
  6. Step 6: Final answer
    x = 124.21

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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.