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Finding the Fourth Proportional to 28,367.20, 42,550.80 and 21,806.20

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Solution

The fourth proportional to 28,367.20, 42,550.80 and 21,806.20 is: 32,709.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,367.20 : 42,550.80 = 21,806.20 : x
  2. Step 2: Convert to fraction form
    28,367.20/42,550.80 = 21,806.20/x
  3. Step 3: Cross multiply
    28,367.20x = 42,550.80 × 21,806.20
  4. Step 4: Simplify right side
    28,367.20x = 927,871,254.96
  5. Step 5: Solve for x
    x = 927,871,254.96/28,367.20
  6. Step 6: Final answer
    x = 32,709.30

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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.