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Finding the Fourth Proportional to 91,679.76, 126,520.32 and 51,391.68

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Solution

The fourth proportional to 91,679.76, 126,520.32 and 51,391.68 is: 70,921.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,679.76 : 126,520.32 = 51,391.68 : x
  2. Step 2: Convert to fraction form
    91,679.76/126,520.32 = 51,391.68/x
  3. Step 3: Cross multiply
    91,679.76x = 126,520.32 × 51,391.68
  4. Step 4: Simplify right side
    91,679.76x = 6,502,091,798.94
  5. Step 5: Solve for x
    x = 6,502,091,798.94/91,679.76
  6. Step 6: Final answer
    x = 70,921.78

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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.