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Finding the Fourth Proportional to 1,096.81, 1,646.29 and 664.81

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Solution

The fourth proportional to 1,096.81, 1,646.29 and 664.81 is: 997.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,096.81 : 1,646.29 = 664.81 : x
  2. Step 2: Convert to fraction form
    1,096.81/1,646.29 = 664.81/x
  3. Step 3: Cross multiply
    1,096.81x = 1,646.29 × 664.81
  4. Step 4: Simplify right side
    1,096.81x = 1,094,470.05
  5. Step 5: Solve for x
    x = 1,094,470.05/1,096.81
  6. Step 6: Final answer
    x = 997.87

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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.