Home / 21,721.38-29,966.60-13,216.69

Finding the Fourth Proportional to 21,721.38, 29,966.60 and 13,216.69

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Solution

The fourth proportional to 21,721.38, 29,966.60 and 13,216.69 is: 18,233.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,721.38 : 29,966.60 = 13,216.69 : x
  2. Step 2: Convert to fraction form
    21,721.38/29,966.60 = 13,216.69/x
  3. Step 3: Cross multiply
    21,721.38x = 29,966.60 × 13,216.69
  4. Step 4: Simplify right side
    21,721.38x = 396,059,121.55
  5. Step 5: Solve for x
    x = 396,059,121.55/21,721.38
  6. Step 6: Final answer
    x = 18,233.61

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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.