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Finding the Fourth Proportional to 2,647.09, 3,970.64 and 699.45

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Solution

The fourth proportional to 2,647.09, 3,970.64 and 699.45 is: 1,049.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,647.09 : 3,970.64 = 699.45 : x
  2. Step 2: Convert to fraction form
    2,647.09/3,970.64 = 699.45/x
  3. Step 3: Cross multiply
    2,647.09x = 3,970.64 × 699.45
  4. Step 4: Simplify right side
    2,647.09x = 2,777,264.15
  5. Step 5: Solve for x
    x = 2,777,264.15/2,647.09
  6. Step 6: Final answer
    x = 1,049.18

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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.