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Finding the Fourth Proportional to 7,991.92, 11,018.88 and 6,219.76

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Solution

The fourth proportional to 7,991.92, 11,018.88 and 6,219.76 is: 8,575.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,991.92 : 11,018.88 = 6,219.76 : x
  2. Step 2: Convert to fraction form
    7,991.92/11,018.88 = 6,219.76/x
  3. Step 3: Cross multiply
    7,991.92x = 11,018.88 × 6,219.76
  4. Step 4: Simplify right side
    7,991.92x = 68,534,789.07
  5. Step 5: Solve for x
    x = 68,534,789.07/7,991.92
  6. Step 6: Final answer
    x = 8,575.51

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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.