Home / 10,115.67-13,959.68-5,639.70

Finding the Fourth Proportional to 10,115.67, 13,959.68 and 5,639.70

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Solution

The fourth proportional to 10,115.67, 13,959.68 and 5,639.70 is: 7,782.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,115.67 : 13,959.68 = 5,639.70 : x
  2. Step 2: Convert to fraction form
    10,115.67/13,959.68 = 5,639.70/x
  3. Step 3: Cross multiply
    10,115.67x = 13,959.68 × 5,639.70
  4. Step 4: Simplify right side
    10,115.67x = 78,728,407.30
  5. Step 5: Solve for x
    x = 78,728,407.30/10,115.67
  6. Step 6: Final answer
    x = 7,782.82

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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.