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Finding the Fourth Proportional to 21,877.20, 32,767.20 and 18,961.20

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Solution

The fourth proportional to 21,877.20, 32,767.20 and 18,961.20 is: 28,399.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,877.20 : 32,767.20 = 18,961.20 : x
  2. Step 2: Convert to fraction form
    21,877.20/32,767.20 = 18,961.20/x
  3. Step 3: Cross multiply
    21,877.20x = 32,767.20 × 18,961.20
  4. Step 4: Simplify right side
    21,877.20x = 621,305,432.64
  5. Step 5: Solve for x
    x = 621,305,432.64/21,877.20
  6. Step 6: Final answer
    x = 28,399.68

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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.