Home / 8,678.55-11,979.35-6,686.56

Finding the Fourth Proportional to 8,678.55, 11,979.35 and 6,686.56

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Solution

The fourth proportional to 8,678.55, 11,979.35 and 6,686.56 is: 9,229.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,678.55 : 11,979.35 = 6,686.56 : x
  2. Step 2: Convert to fraction form
    8,678.55/11,979.35 = 6,686.56/x
  3. Step 3: Cross multiply
    8,678.55x = 11,979.35 × 6,686.56
  4. Step 4: Simplify right side
    8,678.55x = 80,100,642.54
  5. Step 5: Solve for x
    x = 80,100,642.54/8,678.55
  6. Step 6: Final answer
    x = 9,229.73

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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.