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Finding the Fourth Proportional to 91,105.91, 125,644.30 and 57,118.11

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Solution

The fourth proportional to 91,105.91, 125,644.30 and 57,118.11 is: 78,771.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,105.91 : 125,644.30 = 57,118.11 : x
  2. Step 2: Convert to fraction form
    91,105.91/125,644.30 = 57,118.11/x
  3. Step 3: Cross multiply
    91,105.91x = 125,644.30 × 57,118.11
  4. Step 4: Simplify right side
    91,105.91x = 7,176,564,034.46
  5. Step 5: Solve for x
    x = 7,176,564,034.46/91,105.91
  6. Step 6: Final answer
    x = 78,771.66

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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.