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Finding the Fourth Proportional to 2,666.12, 3,998.62 and 718.34

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Solution

The fourth proportional to 2,666.12, 3,998.62 and 718.34 is: 1,077.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.12 : 3,998.62 = 718.34 : x
  2. Step 2: Convert to fraction form
    2,666.12/3,998.62 = 718.34/x
  3. Step 3: Cross multiply
    2,666.12x = 3,998.62 × 718.34
  4. Step 4: Simplify right side
    2,666.12x = 2,872,368.69
  5. Step 5: Solve for x
    x = 2,872,368.69/2,666.12
  6. Step 6: Final answer
    x = 1,077.36

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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.