Home / 7,115.47-9,819.68-3,929.22

Finding the Fourth Proportional to 7,115.47, 9,819.68 and 3,929.22

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Solution

The fourth proportional to 7,115.47, 9,819.68 and 3,929.22 is: 5,422.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.47 : 9,819.68 = 3,929.22 : x
  2. Step 2: Convert to fraction form
    7,115.47/9,819.68 = 3,929.22/x
  3. Step 3: Cross multiply
    7,115.47x = 9,819.68 × 3,929.22
  4. Step 4: Simplify right side
    7,115.47x = 38,583,641.31
  5. Step 5: Solve for x
    x = 38,583,641.31/7,115.47
  6. Step 6: Final answer
    x = 5,422.50

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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.