Home / 20,979.99-31,377-18,656.28

Finding the Fourth Proportional to 20,979.99, 31,377 and 18,656.28

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Solution

The fourth proportional to 20,979.99, 31,377 and 18,656.28 is: 27,901.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.99 : 31,377 = 18,656.28 : x
  2. Step 2: Convert to fraction form
    20,979.99/31,377 = 18,656.28/x
  3. Step 3: Cross multiply
    20,979.99x = 31,377 × 18,656.28
  4. Step 4: Simplify right side
    20,979.99x = 585,378,097.56
  5. Step 5: Solve for x
    x = 585,378,097.56/20,979.99
  6. Step 6: Final answer
    x = 27,901.73

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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.