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Finding the Fourth Proportional to 91,298.89, 126,027.57 and 81,721.86

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Solution

The fourth proportional to 91,298.89, 126,027.57 and 81,721.86 is: 112,807.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,298.89 : 126,027.57 = 81,721.86 : x
  2. Step 2: Convert to fraction form
    91,298.89/126,027.57 = 81,721.86/x
  3. Step 3: Cross multiply
    91,298.89x = 126,027.57 × 81,721.86
  4. Step 4: Simplify right side
    91,298.89x = 10,299,207,431.68
  5. Step 5: Solve for x
    x = 10,299,207,431.68/91,298.89
  6. Step 6: Final answer
    x = 112,807.59

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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.