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Finding the Fourth Proportional to 960.69, 1,438.85 and 849.86

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Solution

The fourth proportional to 960.69, 1,438.85 and 849.86 is: 1,272.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.69 : 1,438.85 = 849.86 : x
  2. Step 2: Convert to fraction form
    960.69/1,438.85 = 849.86/x
  3. Step 3: Cross multiply
    960.69x = 1,438.85 × 849.86
  4. Step 4: Simplify right side
    960.69x = 1,222,821.06
  5. Step 5: Solve for x
    x = 1,222,821.06/960.69
  6. Step 6: Final answer
    x = 1,272.86

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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.