Home / 21,121.38-31,718.33-18,754.83

Finding the Fourth Proportional to 21,121.38, 31,718.33 and 18,754.83

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Solution

The fourth proportional to 21,121.38, 31,718.33 and 18,754.83 is: 28,164.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.38 : 31,718.33 = 18,754.83 : x
  2. Step 2: Convert to fraction form
    21,121.38/31,718.33 = 18,754.83/x
  3. Step 3: Cross multiply
    21,121.38x = 31,718.33 × 18,754.83
  4. Step 4: Simplify right side
    21,121.38x = 594,871,793.26
  5. Step 5: Solve for x
    x = 594,871,793.26/21,121.38
  6. Step 6: Final answer
    x = 28,164.44

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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.