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Finding the Fourth Proportional to 21,229.60, 31,844.40 and 20,922.40

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Solution

The fourth proportional to 21,229.60, 31,844.40 and 20,922.40 is: 31,383.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,229.60 : 31,844.40 = 20,922.40 : x
  2. Step 2: Convert to fraction form
    21,229.60/31,844.40 = 20,922.40/x
  3. Step 3: Cross multiply
    21,229.60x = 31,844.40 × 20,922.40
  4. Step 4: Simplify right side
    21,229.60x = 666,261,274.56
  5. Step 5: Solve for x
    x = 666,261,274.56/21,229.60
  6. Step 6: Final answer
    x = 31,383.60

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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.