Home / 20,979.85-31,470.20-7,829.60

Finding the Fourth Proportional to 20,979.85, 31,470.20 and 7,829.60

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Solution

The fourth proportional to 20,979.85, 31,470.20 and 7,829.60 is: 11,744.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.85 : 31,470.20 = 7,829.60 : x
  2. Step 2: Convert to fraction form
    20,979.85/31,470.20 = 7,829.60/x
  3. Step 3: Cross multiply
    20,979.85x = 31,470.20 × 7,829.60
  4. Step 4: Simplify right side
    20,979.85x = 246,399,077.92
  5. Step 5: Solve for x
    x = 246,399,077.92/20,979.85
  6. Step 6: Final answer
    x = 11,744.56

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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.