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Finding the Fourth Proportional to 91.32, 125.74 and 79.64

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Solution

The fourth proportional to 91.32, 125.74 and 79.64 is: 109.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.32 : 125.74 = 79.64 : x
  2. Step 2: Convert to fraction form
    91.32/125.74 = 79.64/x
  3. Step 3: Cross multiply
    91.32x = 125.74 × 79.64
  4. Step 4: Simplify right side
    91.32x = 10,013.93
  5. Step 5: Solve for x
    x = 10,013.93/91.32
  6. Step 6: Final answer
    x = 109.66

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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.