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Finding the Fourth Proportional to 10,879.68, 15,012.72 and 6,686.88

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Solution

The fourth proportional to 10,879.68, 15,012.72 and 6,686.88 is: 9,227.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,879.68 : 15,012.72 = 6,686.88 : x
  2. Step 2: Convert to fraction form
    10,879.68/15,012.72 = 6,686.88/x
  3. Step 3: Cross multiply
    10,879.68x = 15,012.72 × 6,686.88
  4. Step 4: Simplify right side
    10,879.68x = 100,388,257.11
  5. Step 5: Solve for x
    x = 100,388,257.11/10,879.68
  6. Step 6: Final answer
    x = 9,227.13

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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.