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Finding the Fourth Proportional to 1,040.78, 1,435.78 and 667.56

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Solution

The fourth proportional to 1,040.78, 1,435.78 and 667.56 is: 920.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.78 : 1,435.78 = 667.56 : x
  2. Step 2: Convert to fraction form
    1,040.78/1,435.78 = 667.56/x
  3. Step 3: Cross multiply
    1,040.78x = 1,435.78 × 667.56
  4. Step 4: Simplify right side
    1,040.78x = 958,469.30
  5. Step 5: Solve for x
    x = 958,469.30/1,040.78
  6. Step 6: Final answer
    x = 920.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.