Home / 19,979.20-29,944.80-8,286.40

Finding the Fourth Proportional to 19,979.20, 29,944.80 and 8,286.40

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Solution

The fourth proportional to 19,979.20, 29,944.80 and 8,286.40 is: 12,419.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,979.20 : 29,944.80 = 8,286.40 : x
  2. Step 2: Convert to fraction form
    19,979.20/29,944.80 = 8,286.40/x
  3. Step 3: Cross multiply
    19,979.20x = 29,944.80 × 8,286.40
  4. Step 4: Simplify right side
    19,979.20x = 248,134,590.72
  5. Step 5: Solve for x
    x = 248,134,590.72/19,979.20
  6. Step 6: Final answer
    x = 12,419.65

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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.