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Finding the Fourth Proportional to 2,666.66, 3,998.61 and 1,205.01

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Solution

The fourth proportional to 2,666.66, 3,998.61 and 1,205.01 is: 1,806.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.66 : 3,998.61 = 1,205.01 : x
  2. Step 2: Convert to fraction form
    2,666.66/3,998.61 = 1,205.01/x
  3. Step 3: Cross multiply
    2,666.66x = 3,998.61 × 1,205.01
  4. Step 4: Simplify right side
    2,666.66x = 4,818,365.04
  5. Step 5: Solve for x
    x = 4,818,365.04/2,666.66
  6. Step 6: Final answer
    x = 1,806.89

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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.