Home / 21,979.26-30,331.47-11,907.72

Finding the Fourth Proportional to 21,979.26, 30,331.47 and 11,907.72

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Solution

The fourth proportional to 21,979.26, 30,331.47 and 11,907.72 is: 16,432.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.26 : 30,331.47 = 11,907.72 : x
  2. Step 2: Convert to fraction form
    21,979.26/30,331.47 = 11,907.72/x
  3. Step 3: Cross multiply
    21,979.26x = 30,331.47 × 11,907.72
  4. Step 4: Simplify right side
    21,979.26x = 361,178,651.95
  5. Step 5: Solve for x
    x = 361,178,651.95/21,979.26
  6. Step 6: Final answer
    x = 16,432.70

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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.