Home / 21,480.38-29,642.85-11,921.70

Finding the Fourth Proportional to 21,480.38, 29,642.85 and 11,921.70

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Solution

The fourth proportional to 21,480.38, 29,642.85 and 11,921.70 is: 16,451.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,480.38 : 29,642.85 = 11,921.70 : x
  2. Step 2: Convert to fraction form
    21,480.38/29,642.85 = 11,921.70/x
  3. Step 3: Cross multiply
    21,480.38x = 29,642.85 × 11,921.70
  4. Step 4: Simplify right side
    21,480.38x = 353,393,238.95
  5. Step 5: Solve for x
    x = 353,393,238.95/21,480.38
  6. Step 6: Final answer
    x = 16,451.91

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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.