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Finding the Fourth Proportional to 2,666.50, 3,999.13 and 718.85

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Solution

The fourth proportional to 2,666.50, 3,999.13 and 718.85 is: 1,078.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.50 : 3,999.13 = 718.85 : x
  2. Step 2: Convert to fraction form
    2,666.50/3,999.13 = 718.85/x
  3. Step 3: Cross multiply
    2,666.50x = 3,999.13 × 718.85
  4. Step 4: Simplify right side
    2,666.50x = 2,874,774.60
  5. Step 5: Solve for x
    x = 2,874,774.60/2,666.50
  6. Step 6: Final answer
    x = 1,078.11

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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.