Home / 7,115.28-9,819.72-3,971.76

Finding the Fourth Proportional to 7,115.28, 9,819.72 and 3,971.76

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Solution

The fourth proportional to 7,115.28, 9,819.72 and 3,971.76 is: 5,481.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.28 : 9,819.72 = 3,971.76 : x
  2. Step 2: Convert to fraction form
    7,115.28/9,819.72 = 3,971.76/x
  3. Step 3: Cross multiply
    7,115.28x = 9,819.72 × 3,971.76
  4. Step 4: Simplify right side
    7,115.28x = 39,001,571.11
  5. Step 5: Solve for x
    x = 39,001,571.11/7,115.28
  6. Step 6: Final answer
    x = 5,481.38

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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.