Home / 10,115.85-13,959.92-5,639.68

Finding the Fourth Proportional to 10,115.85, 13,959.92 and 5,639.68

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Solution

The fourth proportional to 10,115.85, 13,959.92 and 5,639.68 is: 7,782.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,115.85 : 13,959.92 = 5,639.68 : x
  2. Step 2: Convert to fraction form
    10,115.85/13,959.92 = 5,639.68/x
  3. Step 3: Cross multiply
    10,115.85x = 13,959.92 × 5,639.68
  4. Step 4: Simplify right side
    10,115.85x = 78,729,481.63
  5. Step 5: Solve for x
    x = 78,729,481.63/10,115.85
  6. Step 6: Final answer
    x = 7,782.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.