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Finding the Fourth Proportional to 91,135.80, 125,825.94 and 57,190.86

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Solution

The fourth proportional to 91,135.80, 125,825.94 and 57,190.86 is: 78,960.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,135.80 : 125,825.94 = 57,190.86 : x
  2. Step 2: Convert to fraction form
    91,135.80/125,825.94 = 57,190.86/x
  3. Step 3: Cross multiply
    91,135.80x = 125,825.94 × 57,190.86
  4. Step 4: Simplify right side
    91,135.80x = 7,196,093,718.91
  5. Step 5: Solve for x
    x = 7,196,093,718.91/91,135.80
  6. Step 6: Final answer
    x = 78,960.12

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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.