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Finding the Fourth Proportional to 1,099.38, 1,647.21 and 665.63

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Solution

The fourth proportional to 1,099.38, 1,647.21 and 665.63 is: 997.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.38 : 1,647.21 = 665.63 : x
  2. Step 2: Convert to fraction form
    1,099.38/1,647.21 = 665.63/x
  3. Step 3: Cross multiply
    1,099.38x = 1,647.21 × 665.63
  4. Step 4: Simplify right side
    1,099.38x = 1,096,424.16
  5. Step 5: Solve for x
    x = 1,096,424.16/1,099.38
  6. Step 6: Final answer
    x = 997.31

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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.