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Finding the Fourth Proportional to 21,972.80, 32,920.80 and 18,900.80

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Solution

The fourth proportional to 21,972.80, 32,920.80 and 18,900.80 is: 28,318.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,972.80 : 32,920.80 = 18,900.80 : x
  2. Step 2: Convert to fraction form
    21,972.80/32,920.80 = 18,900.80/x
  3. Step 3: Cross multiply
    21,972.80x = 32,920.80 × 18,900.80
  4. Step 4: Simplify right side
    21,972.80x = 622,229,456.64
  5. Step 5: Solve for x
    x = 622,229,456.64/21,972.80
  6. Step 6: Final answer
    x = 28,318.17

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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.