Home / 81,278.46-121,921.77-25,878.78

Finding the Fourth Proportional to 81,278.46, 121,921.77 and 25,878.78

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Solution

The fourth proportional to 81,278.46, 121,921.77 and 25,878.78 is: 38,819.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,278.46 : 121,921.77 = 25,878.78 : x
  2. Step 2: Convert to fraction form
    81,278.46/121,921.77 = 25,878.78/x
  3. Step 3: Cross multiply
    81,278.46x = 121,921.77 × 25,878.78
  4. Step 4: Simplify right side
    81,278.46x = 3,155,186,663.04
  5. Step 5: Solve for x
    x = 3,155,186,663.04/81,278.46
  6. Step 6: Final answer
    x = 38,819.47

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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.