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Finding the Fourth Proportional to 7,189.86, 9,921.79 and 4,003.15

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Solution

The fourth proportional to 7,189.86, 9,921.79 and 4,003.15 is: 5,524.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,189.86 : 9,921.79 = 4,003.15 : x
  2. Step 2: Convert to fraction form
    7,189.86/9,921.79 = 4,003.15/x
  3. Step 3: Cross multiply
    7,189.86x = 9,921.79 × 4,003.15
  4. Step 4: Simplify right side
    7,189.86x = 39,718,384.54
  5. Step 5: Solve for x
    x = 39,718,384.54/7,189.86
  6. Step 6: Final answer
    x = 5,524.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.