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Finding the Fourth Proportional to 21,529.80, 32,229.90 and 18,937.80

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Solution

The fourth proportional to 21,529.80, 32,229.90 and 18,937.80 is: 28,349.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,529.80 : 32,229.90 = 18,937.80 : x
  2. Step 2: Convert to fraction form
    21,529.80/32,229.90 = 18,937.80/x
  3. Step 3: Cross multiply
    21,529.80x = 32,229.90 × 18,937.80
  4. Step 4: Simplify right side
    21,529.80x = 610,363,400.22
  5. Step 5: Solve for x
    x = 610,363,400.22/21,529.80
  6. Step 6: Final answer
    x = 28,349.70

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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.