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Finding the Fourth Proportional to 2,666.89, 4,000.26 and 719.21

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Solution

The fourth proportional to 2,666.89, 4,000.26 and 719.21 is: 1,078.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.89 : 4,000.26 = 719.21 : x
  2. Step 2: Convert to fraction form
    2,666.89/4,000.26 = 719.21/x
  3. Step 3: Cross multiply
    2,666.89x = 4,000.26 × 719.21
  4. Step 4: Simplify right side
    2,666.89x = 2,877,023.40
  5. Step 5: Solve for x
    x = 2,877,023.40/2,666.89
  6. Step 6: Final answer
    x = 1,078.79

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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.