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Finding the Fourth Proportional to 18,879.38, 28,318.88 and 5,028.38

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Solution

The fourth proportional to 18,879.38, 28,318.88 and 5,028.38 is: 7,542.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.38 : 28,318.88 = 5,028.38 : x
  2. Step 2: Convert to fraction form
    18,879.38/28,318.88 = 5,028.38/x
  3. Step 3: Cross multiply
    18,879.38x = 28,318.88 × 5,028.38
  4. Step 4: Simplify right side
    18,879.38x = 142,398,089.81
  5. Step 5: Solve for x
    x = 142,398,089.81/18,879.38
  6. Step 6: Final answer
    x = 7,542.52

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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.