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Finding the Fourth Proportional to 2,647.72, 3,971.75 and 699.88

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Solution

The fourth proportional to 2,647.72, 3,971.75 and 699.88 is: 1,049.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,647.72 : 3,971.75 = 699.88 : x
  2. Step 2: Convert to fraction form
    2,647.72/3,971.75 = 699.88/x
  3. Step 3: Cross multiply
    2,647.72x = 3,971.75 × 699.88
  4. Step 4: Simplify right side
    2,647.72x = 2,779,748.39
  5. Step 5: Solve for x
    x = 2,779,748.39/2,647.72
  6. Step 6: Final answer
    x = 1,049.86

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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.