Home / 21,976.90-30,328.22-11,905.32

Finding the Fourth Proportional to 21,976.90, 30,328.22 and 11,905.32

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Solution

The fourth proportional to 21,976.90, 30,328.22 and 11,905.32 is: 16,429.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,976.90 : 30,328.22 = 11,905.32 : x
  2. Step 2: Convert to fraction form
    21,976.90/30,328.22 = 11,905.32/x
  3. Step 3: Cross multiply
    21,976.90x = 30,328.22 × 11,905.32
  4. Step 4: Simplify right side
    21,976.90x = 361,067,164.13
  5. Step 5: Solve for x
    x = 361,067,164.13/21,976.90
  6. Step 6: Final answer
    x = 16,429.39

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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.