Home / 21,979.29-30,331.56-12,288.75

Finding the Fourth Proportional to 21,979.29, 30,331.56 and 12,288.75

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Solution

The fourth proportional to 21,979.29, 30,331.56 and 12,288.75 is: 16,958.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.29 : 30,331.56 = 12,288.75 : x
  2. Step 2: Convert to fraction form
    21,979.29/30,331.56 = 12,288.75/x
  3. Step 3: Cross multiply
    21,979.29x = 30,331.56 × 12,288.75
  4. Step 4: Simplify right side
    21,979.29x = 372,736,957.95
  5. Step 5: Solve for x
    x = 372,736,957.95/21,979.29
  6. Step 6: Final answer
    x = 16,958.55

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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.