Home / 8,678.19-12,999.84-3,991.65

Finding the Fourth Proportional to 8,678.19, 12,999.84 and 3,991.65

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Solution

The fourth proportional to 8,678.19, 12,999.84 and 3,991.65 is: 5,979.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,678.19 : 12,999.84 = 3,991.65 : x
  2. Step 2: Convert to fraction form
    8,678.19/12,999.84 = 3,991.65/x
  3. Step 3: Cross multiply
    8,678.19x = 12,999.84 × 3,991.65
  4. Step 4: Simplify right side
    8,678.19x = 51,890,879.76
  5. Step 5: Solve for x
    x = 51,890,879.76/8,678.19
  6. Step 6: Final answer
    x = 5,979.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.