Home / 21,555.92-29,761.80-15,891.32

Finding the Fourth Proportional to 21,555.92, 29,761.80 and 15,891.32

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Solution

The fourth proportional to 21,555.92, 29,761.80 and 15,891.32 is: 21,940.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,555.92 : 29,761.80 = 15,891.32 : x
  2. Step 2: Convert to fraction form
    21,555.92/29,761.80 = 15,891.32/x
  3. Step 3: Cross multiply
    21,555.92x = 29,761.80 × 15,891.32
  4. Step 4: Simplify right side
    21,555.92x = 472,954,287.58
  5. Step 5: Solve for x
    x = 472,954,287.58/21,555.92
  6. Step 6: Final answer
    x = 21,940.81

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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.