Home / 20,979.79-31,513.44-12,231.79

Finding the Fourth Proportional to 20,979.79, 31,513.44 and 12,231.79

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Solution

The fourth proportional to 20,979.79, 31,513.44 and 12,231.79 is: 18,373.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.79 : 31,513.44 = 12,231.79 : x
  2. Step 2: Convert to fraction form
    20,979.79/31,513.44 = 12,231.79/x
  3. Step 3: Cross multiply
    20,979.79x = 31,513.44 × 12,231.79
  4. Step 4: Simplify right side
    20,979.79x = 385,465,780.26
  5. Step 5: Solve for x
    x = 385,465,780.26/20,979.79
  6. Step 6: Final answer
    x = 18,373.20

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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.