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Finding the Fourth Proportional to 7,918.11, 11,879.87 and 2,989.17

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Solution

The fourth proportional to 7,918.11, 11,879.87 and 2,989.17 is: 4,484.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,918.11 : 11,879.87 = 2,989.17 : x
  2. Step 2: Convert to fraction form
    7,918.11/11,879.87 = 2,989.17/x
  3. Step 3: Cross multiply
    7,918.11x = 11,879.87 × 2,989.17
  4. Step 4: Simplify right side
    7,918.11x = 35,510,936.06
  5. Step 5: Solve for x
    x = 35,510,936.06/7,918.11
  6. Step 6: Final answer
    x = 4,484.77

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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.