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Finding the Fourth Proportional to 2,666.05, 3,999.17 and 718.30

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Solution

The fourth proportional to 2,666.05, 3,999.17 and 718.30 is: 1,077.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.05 : 3,999.17 = 718.30 : x
  2. Step 2: Convert to fraction form
    2,666.05/3,999.17 = 718.30/x
  3. Step 3: Cross multiply
    2,666.05x = 3,999.17 × 718.30
  4. Step 4: Simplify right side
    2,666.05x = 2,872,615.60
  5. Step 5: Solve for x
    x = 2,872,615.60/2,666.05
  6. Step 6: Final answer
    x = 1,077.48

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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.