Home / 78,278.10-117,406.14-25,680.78

Finding the Fourth Proportional to 78,278.10, 117,406.14 and 25,680.78

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Solution

The fourth proportional to 78,278.10, 117,406.14 and 25,680.78 is: 38,517.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,278.10 : 117,406.14 = 25,680.78 : x
  2. Step 2: Convert to fraction form
    78,278.10/117,406.14 = 25,680.78/x
  3. Step 3: Cross multiply
    78,278.10x = 117,406.14 × 25,680.78
  4. Step 4: Simplify right side
    78,278.10x = 3,015,081,251.99
  5. Step 5: Solve for x
    x = 3,015,081,251.99/78,278.10
  6. Step 6: Final answer
    x = 38,517.56

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1.5x scale

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.