Home / 20,478.80-30,718.20-7,331.60

Finding the Fourth Proportional to 20,478.80, 30,718.20 and 7,331.60

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Solution

The fourth proportional to 20,478.80, 30,718.20 and 7,331.60 is: 10,997.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.80 : 30,718.20 = 7,331.60 : x
  2. Step 2: Convert to fraction form
    20,478.80/30,718.20 = 7,331.60/x
  3. Step 3: Cross multiply
    20,478.80x = 30,718.20 × 7,331.60
  4. Step 4: Simplify right side
    20,478.80x = 225,213,555.12
  5. Step 5: Solve for x
    x = 225,213,555.12/20,478.80
  6. Step 6: Final answer
    x = 10,997.40

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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.