Home / 12,979.28-19,470.55-5,080.78

Finding the Fourth Proportional to 12,979.28, 19,470.55 and 5,080.78

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Solution

The fourth proportional to 12,979.28, 19,470.55 and 5,080.78 is: 7,621.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,979.28 : 19,470.55 = 5,080.78 : x
  2. Step 2: Convert to fraction form
    12,979.28/19,470.55 = 5,080.78/x
  3. Step 3: Cross multiply
    12,979.28x = 19,470.55 × 5,080.78
  4. Step 4: Simplify right side
    12,979.28x = 98,925,519.65
  5. Step 5: Solve for x
    x = 98,925,519.65/12,979.28
  6. Step 6: Final answer
    x = 7,621.80

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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.