Home / 7,115.42-9,819.33-3,971.78

Finding the Fourth Proportional to 7,115.42, 9,819.33 and 3,971.78

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Solution

The fourth proportional to 7,115.42, 9,819.33 and 3,971.78 is: 5,481.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.42 : 9,819.33 = 3,971.78 : x
  2. Step 2: Convert to fraction form
    7,115.42/9,819.33 = 3,971.78/x
  3. Step 3: Cross multiply
    7,115.42x = 9,819.33 × 3,971.78
  4. Step 4: Simplify right side
    7,115.42x = 39,000,218.51
  5. Step 5: Solve for x
    x = 39,000,218.51/7,115.42
  6. Step 6: Final answer
    x = 5,481.08

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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.