Home / 20,960.20-31,439.40-7,109.20

Finding the Fourth Proportional to 20,960.20, 31,439.40 and 7,109.20

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Solution

The fourth proportional to 20,960.20, 31,439.40 and 7,109.20 is: 10,663.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,960.20 : 31,439.40 = 7,109.20 : x
  2. Step 2: Convert to fraction form
    20,960.20/31,439.40 = 7,109.20/x
  3. Step 3: Cross multiply
    20,960.20x = 31,439.40 × 7,109.20
  4. Step 4: Simplify right side
    20,960.20x = 223,508,982.48
  5. Step 5: Solve for x
    x = 223,508,982.48/20,960.20
  6. Step 6: Final answer
    x = 10,663.49

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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.