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Finding the Fourth Proportional to 21,881.20, 32,773.20 and 18,965.20

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Solution

The fourth proportional to 21,881.20, 32,773.20 and 18,965.20 is: 28,405.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,881.20 : 32,773.20 = 18,965.20 : x
  2. Step 2: Convert to fraction form
    21,881.20/32,773.20 = 18,965.20/x
  3. Step 3: Cross multiply
    21,881.20x = 32,773.20 × 18,965.20
  4. Step 4: Simplify right side
    21,881.20x = 621,550,292.64
  5. Step 5: Solve for x
    x = 621,550,292.64/21,881.20
  6. Step 6: Final answer
    x = 28,405.68

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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.