Home / 20,478.40-30,717.60-7,331.20

Finding the Fourth Proportional to 20,478.40, 30,717.60 and 7,331.20

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Solution

The fourth proportional to 20,478.40, 30,717.60 and 7,331.20 is: 10,996.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.40 : 30,717.60 = 7,331.20 : x
  2. Step 2: Convert to fraction form
    20,478.40/30,717.60 = 7,331.20/x
  3. Step 3: Cross multiply
    20,478.40x = 30,717.60 × 7,331.20
  4. Step 4: Simplify right side
    20,478.40x = 225,196,869.12
  5. Step 5: Solve for x
    x = 225,196,869.12/20,478.40
  6. Step 6: Final answer
    x = 10,996.80

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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.