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Finding the Fourth Proportional to 21,737.20, 32,557.20 and 18,821.20

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Solution

The fourth proportional to 21,737.20, 32,557.20 and 18,821.20 is: 28,189.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,737.20 : 32,557.20 = 18,821.20 : x
  2. Step 2: Convert to fraction form
    21,737.20/32,557.20 = 18,821.20/x
  3. Step 3: Cross multiply
    21,737.20x = 32,557.20 × 18,821.20
  4. Step 4: Simplify right side
    21,737.20x = 612,765,572.64
  5. Step 5: Solve for x
    x = 612,765,572.64/21,737.20
  6. Step 6: Final answer
    x = 28,189.72

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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.