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Finding the Fourth Proportional to 1,324.16, 1,986.80 and 665.69

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Solution

The fourth proportional to 1,324.16, 1,986.80 and 665.69 is: 998.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.16 : 1,986.80 = 665.69 : x
  2. Step 2: Convert to fraction form
    1,324.16/1,986.80 = 665.69/x
  3. Step 3: Cross multiply
    1,324.16x = 1,986.80 × 665.69
  4. Step 4: Simplify right side
    1,324.16x = 1,322,592.89
  5. Step 5: Solve for x
    x = 1,322,592.89/1,324.16
  6. Step 6: Final answer
    x = 998.82

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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.