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Finding the Fourth Proportional to 960.78, 1,440.33 and 405.42

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Solution

The fourth proportional to 960.78, 1,440.33 and 405.42 is: 607.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.78 : 1,440.33 = 405.42 : x
  2. Step 2: Convert to fraction form
    960.78/1,440.33 = 405.42/x
  3. Step 3: Cross multiply
    960.78x = 1,440.33 × 405.42
  4. Step 4: Simplify right side
    960.78x = 583,938.59
  5. Step 5: Solve for x
    x = 583,938.59/960.78
  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.