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Finding the Fourth Proportional to 960.68, 1,440.78 and 311.46

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Solution

The fourth proportional to 960.68, 1,440.78 and 311.46 is: 467.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.68 : 1,440.78 = 311.46 : x
  2. Step 2: Convert to fraction form
    960.68/1,440.78 = 311.46/x
  3. Step 3: Cross multiply
    960.68x = 1,440.78 × 311.46
  4. Step 4: Simplify right side
    960.68x = 448,745.34
  5. Step 5: Solve for x
    x = 448,745.34/960.68
  6. Step 6: Final answer
    x = 467.11

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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.