Home / 21,540.87-29,706.35-13,979.12

Finding the Fourth Proportional to 21,540.87, 29,706.35 and 13,979.12

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Solution

The fourth proportional to 21,540.87, 29,706.35 and 13,979.12 is: 19,278.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,540.87 : 29,706.35 = 13,979.12 : x
  2. Step 2: Convert to fraction form
    21,540.87/29,706.35 = 13,979.12/x
  3. Step 3: Cross multiply
    21,540.87x = 29,706.35 × 13,979.12
  4. Step 4: Simplify right side
    21,540.87x = 415,268,412.98
  5. Step 5: Solve for x
    x = 415,268,412.98/21,540.87
  6. Step 6: Final answer
    x = 19,278.16

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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.