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Finding the Fourth Proportional to 18,728.52, 28,089.88 and 5,578.80

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Solution

The fourth proportional to 18,728.52, 28,089.88 and 5,578.80 is: 8,367.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,728.52 : 28,089.88 = 5,578.80 : x
  2. Step 2: Convert to fraction form
    18,728.52/28,089.88 = 5,578.80/x
  3. Step 3: Cross multiply
    18,728.52x = 28,089.88 × 5,578.80
  4. Step 4: Simplify right side
    18,728.52x = 156,707,822.54
  5. Step 5: Solve for x
    x = 156,707,822.54/18,728.52
  6. Step 6: Final answer
    x = 8,367.34

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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.