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Finding the Fourth Proportional to 21,828.20, 32,693.70 and 18,912.20

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Solution

The fourth proportional to 21,828.20, 32,693.70 and 18,912.20 is: 28,326.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,828.20 : 32,693.70 = 18,912.20 : x
  2. Step 2: Convert to fraction form
    21,828.20/32,693.70 = 18,912.20/x
  3. Step 3: Cross multiply
    21,828.20x = 32,693.70 × 18,912.20
  4. Step 4: Simplify right side
    21,828.20x = 618,309,793.14
  5. Step 5: Solve for x
    x = 618,309,793.14/21,828.20
  6. Step 6: Final answer
    x = 28,326.19

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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.