Home / 39,219.38-54,121.80-21,990.59

Finding the Fourth Proportional to 39,219.38, 54,121.80 and 21,990.59

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Solution

The fourth proportional to 39,219.38, 54,121.80 and 21,990.59 is: 30,346.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,219.38 : 54,121.80 = 21,990.59 : x
  2. Step 2: Convert to fraction form
    39,219.38/54,121.80 = 21,990.59/x
  3. Step 3: Cross multiply
    39,219.38x = 54,121.80 × 21,990.59
  4. Step 4: Simplify right side
    39,219.38x = 1,190,170,449.17
  5. Step 5: Solve for x
    x = 1,190,170,449.17/39,219.38
  6. Step 6: Final answer
    x = 30,346.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.