Home / 10,115.92-13,959.12-5,639.32

Finding the Fourth Proportional to 10,115.92, 13,959.12 and 5,639.32

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Solution

The fourth proportional to 10,115.92, 13,959.12 and 5,639.32 is: 7,781.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,115.92 : 13,959.12 = 5,639.32 : x
  2. Step 2: Convert to fraction form
    10,115.92/13,959.12 = 5,639.32/x
  3. Step 3: Cross multiply
    10,115.92x = 13,959.12 × 5,639.32
  4. Step 4: Simplify right side
    10,115.92x = 78,719,944.60
  5. Step 5: Solve for x
    x = 78,719,944.60/10,115.92
  6. Step 6: Final answer
    x = 7,781.79

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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.