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Finding the Fourth Proportional to 1,324.59, 1,987.25 and 665.67

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Solution

The fourth proportional to 1,324.59, 1,987.25 and 665.67 is: 998.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.59 : 1,987.25 = 665.67 : x
  2. Step 2: Convert to fraction form
    1,324.59/1,987.25 = 665.67/x
  3. Step 3: Cross multiply
    1,324.59x = 1,987.25 × 665.67
  4. Step 4: Simplify right side
    1,324.59x = 1,322,849.38
  5. Step 5: Solve for x
    x = 1,322,849.38/1,324.59
  6. Step 6: Final answer
    x = 998.69

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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.