Home / 21,680.73-29,920.05-12,120.37

Finding the Fourth Proportional to 21,680.73, 29,920.05 and 12,120.37

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Solution

The fourth proportional to 21,680.73, 29,920.05 and 12,120.37 is: 16,726.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,680.73 : 29,920.05 = 12,120.37 : x
  2. Step 2: Convert to fraction form
    21,680.73/29,920.05 = 12,120.37/x
  3. Step 3: Cross multiply
    21,680.73x = 29,920.05 × 12,120.37
  4. Step 4: Simplify right side
    21,680.73x = 362,642,001.62
  5. Step 5: Solve for x
    x = 362,642,001.62/21,680.73
  6. Step 6: Final answer
    x = 16,726.47

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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.