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Finding the Fourth Proportional to 91.30, 125.98 and 86.74

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Solution

The fourth proportional to 91.30, 125.98 and 86.74 is: 119.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.30 : 125.98 = 86.74 : x
  2. Step 2: Convert to fraction form
    91.30/125.98 = 86.74/x
  3. Step 3: Cross multiply
    91.30x = 125.98 × 86.74
  4. Step 4: Simplify right side
    91.30x = 10,927.51
  5. Step 5: Solve for x
    x = 10,927.51/91.30
  6. Step 6: Final answer
    x = 119.69

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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.