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Finding the Fourth Proportional to 91,691.80, 126,534.58 and 51,405.57

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Solution

The fourth proportional to 91,691.80, 126,534.58 and 51,405.57 is: 70,939.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,691.80 : 126,534.58 = 51,405.57 : x
  2. Step 2: Convert to fraction form
    91,691.80/126,534.58 = 51,405.57/x
  3. Step 3: Cross multiply
    91,691.80x = 126,534.58 × 51,405.57
  4. Step 4: Simplify right side
    91,691.80x = 6,504,582,081.10
  5. Step 5: Solve for x
    x = 6,504,582,081.10/91,691.80
  6. Step 6: Final answer
    x = 70,939.63

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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.