Home / 7,115.91-9,820.10-3,972.09

Finding the Fourth Proportional to 7,115.91, 9,820.10 and 3,972.09

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Solution

The fourth proportional to 7,115.91, 9,820.10 and 3,972.09 is: 5,481.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.91 : 9,820.10 = 3,972.09 : x
  2. Step 2: Convert to fraction form
    7,115.91/9,820.10 = 3,972.09/x
  3. Step 3: Cross multiply
    7,115.91x = 9,820.10 × 3,972.09
  4. Step 4: Simplify right side
    7,115.91x = 39,006,367.76
  5. Step 5: Solve for x
    x = 39,006,367.76/7,115.91
  6. Step 6: Final answer
    x = 5,481.57

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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.