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Finding the Fourth Proportional to 960.24, 1,440.60 and 405.12

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Solution

The fourth proportional to 960.24, 1,440.60 and 405.12 is: 607.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.24 : 1,440.60 = 405.12 : x
  2. Step 2: Convert to fraction form
    960.24/1,440.60 = 405.12/x
  3. Step 3: Cross multiply
    960.24x = 1,440.60 × 405.12
  4. Step 4: Simplify right side
    960.24x = 583,615.87
  5. Step 5: Solve for x
    x = 583,615.87/960.24
  6. Step 6: Final answer
    x = 607.78

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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.