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Finding the Fourth Proportional to 21,086.22, 31,629.34 and 8,612.12

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Solution

The fourth proportional to 21,086.22, 31,629.34 and 8,612.12 is: 12,918.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,086.22 : 31,629.34 = 8,612.12 : x
  2. Step 2: Convert to fraction form
    21,086.22/31,629.34 = 8,612.12/x
  3. Step 3: Cross multiply
    21,086.22x = 31,629.34 × 8,612.12
  4. Step 4: Simplify right side
    21,086.22x = 272,395,713.00
  5. Step 5: Solve for x
    x = 272,395,713.00/21,086.22
  6. Step 6: Final answer
    x = 12,918.18

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.