Home / 21,391.25-29,520-11,959.79

Finding the Fourth Proportional to 21,391.25, 29,520 and 11,959.79

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Solution

The fourth proportional to 21,391.25, 29,520 and 11,959.79 is: 16,504.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,391.25 : 29,520 = 11,959.79 : x
  2. Step 2: Convert to fraction form
    21,391.25/29,520 = 11,959.79/x
  3. Step 3: Cross multiply
    21,391.25x = 29,520 × 11,959.79
  4. Step 4: Simplify right side
    21,391.25x = 353,052,853.20
  5. Step 5: Solve for x
    x = 353,052,853.20/21,391.25
  6. Step 6: Final answer
    x = 16,504.55

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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.