Home / 81,143.24-121,815.09-38,489.45

Finding the Fourth Proportional to 81,143.24, 121,815.09 and 38,489.45

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Solution

The fourth proportional to 81,143.24, 121,815.09 and 38,489.45 is: 57,781.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,143.24 : 121,815.09 = 38,489.45 : x
  2. Step 2: Convert to fraction form
    81,143.24/121,815.09 = 38,489.45/x
  3. Step 3: Cross multiply
    81,143.24x = 121,815.09 × 38,489.45
  4. Step 4: Simplify right side
    81,143.24x = 4,688,595,206.73
  5. Step 5: Solve for x
    x = 4,688,595,206.73/81,143.24
  6. Step 6: Final answer
    x = 57,781.71

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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.