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Finding the Fourth Proportional to 21,891.90, 30,194.17 and 18,872.22

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Solution

The fourth proportional to 21,891.90, 30,194.17 and 18,872.22 is: 26,029.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891.90 : 30,194.17 = 18,872.22 : x
  2. Step 2: Convert to fraction form
    21,891.90/30,194.17 = 18,872.22/x
  3. Step 3: Cross multiply
    21,891.90x = 30,194.17 × 18,872.22
  4. Step 4: Simplify right side
    21,891.90x = 569,831,085.00
  5. Step 5: Solve for x
    x = 569,831,085.00/21,891.90
  6. Step 6: Final answer
    x = 26,029.31

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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.