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Finding the Fourth Proportional to 7,120.97, 9,819.39 and 4,886.11

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Solution

The fourth proportional to 7,120.97, 9,819.39 and 4,886.11 is: 6,737.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120.97 : 9,819.39 = 4,886.11 : x
  2. Step 2: Convert to fraction form
    7,120.97/9,819.39 = 4,886.11/x
  3. Step 3: Cross multiply
    7,120.97x = 9,819.39 × 4,886.11
  4. Step 4: Simplify right side
    7,120.97x = 47,978,619.67
  5. Step 5: Solve for x
    x = 47,978,619.67/7,120.97
  6. Step 6: Final answer
    x = 6,737.65

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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.