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Finding the Fourth Proportional to 18,979.20, 28,468.78 and 5,128.20

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Solution

The fourth proportional to 18,979.20, 28,468.78 and 5,128.20 is: 7,692.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.20 : 28,468.78 = 5,128.20 : x
  2. Step 2: Convert to fraction form
    18,979.20/28,468.78 = 5,128.20/x
  3. Step 3: Cross multiply
    18,979.20x = 28,468.78 × 5,128.20
  4. Step 4: Simplify right side
    18,979.20x = 145,993,597.60
  5. Step 5: Solve for x
    x = 145,993,597.60/18,979.20
  6. Step 6: Final answer
    x = 7,692.29

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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.