Home / 81,685.20-122,470.14-31,723.68

Finding the Fourth Proportional to 81,685.20, 122,470.14 and 31,723.68

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Solution

The fourth proportional to 81,685.20, 122,470.14 and 31,723.68 is: 47,563.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,685.20 : 122,470.14 = 31,723.68 : x
  2. Step 2: Convert to fraction form
    81,685.20/122,470.14 = 31,723.68/x
  3. Step 3: Cross multiply
    81,685.20x = 122,470.14 × 31,723.68
  4. Step 4: Simplify right side
    81,685.20x = 3,885,203,530.92
  5. Step 5: Solve for x
    x = 3,885,203,530.92/81,685.20
  6. Step 6: Final answer
    x = 47,563.13

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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.