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Finding the Fourth Proportional to 7,115.87, 9,819.71 and 3,929.40

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Solution

The fourth proportional to 7,115.87, 9,819.71 and 3,929.40 is: 5,422.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.87 : 9,819.71 = 3,929.40 : x
  2. Step 2: Convert to fraction form
    7,115.87/9,819.71 = 3,929.40/x
  3. Step 3: Cross multiply
    7,115.87x = 9,819.71 × 3,929.40
  4. Step 4: Simplify right side
    7,115.87x = 38,585,548.83
  5. Step 5: Solve for x
    x = 38,585,548.83/7,115.87
  6. Step 6: Final answer
    x = 5,422.47

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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.