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Finding the Fourth Proportional to 960.64, 1,438.89 and 650.79

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Solution

The fourth proportional to 960.64, 1,438.89 and 650.79 is: 974.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.64 : 1,438.89 = 650.79 : x
  2. Step 2: Convert to fraction form
    960.64/1,438.89 = 650.79/x
  3. Step 3: Cross multiply
    960.64x = 1,438.89 × 650.79
  4. Step 4: Simplify right side
    960.64x = 936,418.82
  5. Step 5: Solve for x
    x = 936,418.82/960.64
  6. Step 6: Final answer
    x = 974.79

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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.