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Finding the Fourth Proportional to 81,689.76, 122,425.61 and 43,661.07

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Solution

The fourth proportional to 81,689.76, 122,425.61 and 43,661.07 is: 65,433.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,689.76 : 122,425.61 = 43,661.07 : x
  2. Step 2: Convert to fraction form
    81,689.76/122,425.61 = 43,661.07/x
  3. Step 3: Cross multiply
    81,689.76x = 122,425.61 × 43,661.07
  4. Step 4: Simplify right side
    81,689.76x = 5,345,232,909.70
  5. Step 5: Solve for x
    x = 5,345,232,909.70/81,689.76
  6. Step 6: Final answer
    x = 65,433.33

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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.