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Finding the Fourth Proportional to 21,500.80, 32,251.20 and 18,908.80

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Solution

The fourth proportional to 21,500.80, 32,251.20 and 18,908.80 is: 28,363.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,500.80 : 32,251.20 = 18,908.80 : x
  2. Step 2: Convert to fraction form
    21,500.80/32,251.20 = 18,908.80/x
  3. Step 3: Cross multiply
    21,500.80x = 32,251.20 × 18,908.80
  4. Step 4: Simplify right side
    21,500.80x = 609,831,490.56
  5. Step 5: Solve for x
    x = 609,831,490.56/21,500.80
  6. Step 6: Final answer
    x = 28,363.20

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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.