Home / 7,115.84-9,819.79-3,929.13

Finding the Fourth Proportional to 7,115.84, 9,819.79 and 3,929.13

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Solution

The fourth proportional to 7,115.84, 9,819.79 and 3,929.13 is: 5,422.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.84 : 9,819.79 = 3,929.13 : x
  2. Step 2: Convert to fraction form
    7,115.84/9,819.79 = 3,929.13/x
  3. Step 3: Cross multiply
    7,115.84x = 9,819.79 × 3,929.13
  4. Step 4: Simplify right side
    7,115.84x = 38,583,276.90
  5. Step 5: Solve for x
    x = 38,583,276.90/7,115.84
  6. Step 6: Final answer
    x = 5,422.17

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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.