Home / 20,220.24-30,331.80-5,428.80

Finding the Fourth Proportional to 20,220.24, 30,331.80 and 5,428.80

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Solution

The fourth proportional to 20,220.24, 30,331.80 and 5,428.80 is: 8,143.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,220.24 : 30,331.80 = 5,428.80 : x
  2. Step 2: Convert to fraction form
    20,220.24/30,331.80 = 5,428.80/x
  3. Step 3: Cross multiply
    20,220.24x = 30,331.80 × 5,428.80
  4. Step 4: Simplify right side
    20,220.24x = 164,665,275.84
  5. Step 5: Solve for x
    x = 164,665,275.84/20,220.24
  6. Step 6: Final answer
    x = 8,143.59

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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.