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Finding the Fourth Proportional to 960.48, 1,440.88 and 311.20

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Solution

The fourth proportional to 960.48, 1,440.88 and 311.20 is: 466.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.48 : 1,440.88 = 311.20 : x
  2. Step 2: Convert to fraction form
    960.48/1,440.88 = 311.20/x
  3. Step 3: Cross multiply
    960.48x = 1,440.88 × 311.20
  4. Step 4: Simplify right side
    960.48x = 448,401.86
  5. Step 5: Solve for x
    x = 448,401.86/960.48
  6. Step 6: Final answer
    x = 466.85

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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.