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Finding the Fourth Proportional to 18,879.79, 28,319.73 and 5,028.79

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Solution

The fourth proportional to 18,879.79, 28,319.73 and 5,028.79 is: 7,543.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.79 : 28,319.73 = 5,028.79 : x
  2. Step 2: Convert to fraction form
    18,879.79/28,319.73 = 5,028.79/x
  3. Step 3: Cross multiply
    18,879.79x = 28,319.73 × 5,028.79
  4. Step 4: Simplify right side
    18,879.79x = 142,413,975.03
  5. Step 5: Solve for x
    x = 142,413,975.03/18,879.79
  6. Step 6: Final answer
    x = 7,543.20

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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.