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Finding the Fourth Proportional to 960.10, 1,440.39 and 310.90

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Solution

The fourth proportional to 960.10, 1,440.39 and 310.90 is: 466.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.10 : 1,440.39 = 310.90 : x
  2. Step 2: Convert to fraction form
    960.10/1,440.39 = 310.90/x
  3. Step 3: Cross multiply
    960.10x = 1,440.39 × 310.90
  4. Step 4: Simplify right side
    960.10x = 447,817.25
  5. Step 5: Solve for x
    x = 447,817.25/960.10
  6. Step 6: Final answer
    x = 466.43

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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.