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Finding the Fourth Proportional to 91,385.40, 136,963.94 and 43,991.69

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Solution

The fourth proportional to 91,385.40, 136,963.94 and 43,991.69 is: 65,932.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,385.40 : 136,963.94 = 43,991.69 : x
  2. Step 2: Convert to fraction form
    91,385.40/136,963.94 = 43,991.69/x
  3. Step 3: Cross multiply
    91,385.40x = 136,963.94 × 43,991.69
  4. Step 4: Simplify right side
    91,385.40x = 6,025,274,284.88
  5. Step 5: Solve for x
    x = 6,025,274,284.88/91,385.40
  6. Step 6: Final answer
    x = 65,932.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.