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Finding the Fourth Proportional to 960.56, 1,440.76 and 343.92

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Solution

The fourth proportional to 960.56, 1,440.76 and 343.92 is: 515.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.56 : 1,440.76 = 343.92 : x
  2. Step 2: Convert to fraction form
    960.56/1,440.76 = 343.92/x
  3. Step 3: Cross multiply
    960.56x = 1,440.76 × 343.92
  4. Step 4: Simplify right side
    960.56x = 495,506.18
  5. Step 5: Solve for x
    x = 495,506.18/960.56
  6. Step 6: Final answer
    x = 515.85

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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.