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Finding the Fourth Proportional to 18,879.76, 28,319.64 and 6,399.84

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Solution

The fourth proportional to 18,879.76, 28,319.64 and 6,399.84 is: 9,599.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.76 : 28,319.64 = 6,399.84 : x
  2. Step 2: Convert to fraction form
    18,879.76/28,319.64 = 6,399.84/x
  3. Step 3: Cross multiply
    18,879.76x = 28,319.64 × 6,399.84
  4. Step 4: Simplify right side
    18,879.76x = 181,241,164.86
  5. Step 5: Solve for x
    x = 181,241,164.86/18,879.76
  6. Step 6: Final answer
    x = 9,599.76

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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.