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Finding the Fourth Proportional to 960.98, 1,440.20 and 550.31

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Solution

The fourth proportional to 960.98, 1,440.20 and 550.31 is: 824.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.98 : 1,440.20 = 550.31 : x
  2. Step 2: Convert to fraction form
    960.98/1,440.20 = 550.31/x
  3. Step 3: Cross multiply
    960.98x = 1,440.20 × 550.31
  4. Step 4: Simplify right side
    960.98x = 792,550.64
  5. Step 5: Solve for x
    x = 792,550.64/960.98
  6. Step 6: Final answer
    x = 824.74

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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.