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Finding the Fourth Proportional to 18,879.89, 28,319.96 and 6,400.08

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Solution

The fourth proportional to 18,879.89, 28,319.96 and 6,400.08 is: 9,600.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.89 : 28,319.96 = 6,400.08 : x
  2. Step 2: Convert to fraction form
    18,879.89/28,319.96 = 6,400.08/x
  3. Step 3: Cross multiply
    18,879.89x = 28,319.96 × 6,400.08
  4. Step 4: Simplify right side
    18,879.89x = 181,250,025.60
  5. Step 5: Solve for x
    x = 181,250,025.60/18,879.89
  6. Step 6: Final answer
    x = 9,600.17

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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.