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Finding the Fourth Proportional to 2,666.18, 3,998.67 and 718.54

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Solution

The fourth proportional to 2,666.18, 3,998.67 and 718.54 is: 1,077.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.18 : 3,998.67 = 718.54 : x
  2. Step 2: Convert to fraction form
    2,666.18/3,998.67 = 718.54/x
  3. Step 3: Cross multiply
    2,666.18x = 3,998.67 × 718.54
  4. Step 4: Simplify right side
    2,666.18x = 2,873,191.65
  5. Step 5: Solve for x
    x = 2,873,191.65/2,666.18
  6. Step 6: Final answer
    x = 1,077.64

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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.