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Finding the Fourth Proportional to 1,040.40, 1,435.95 and 667.85

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Solution

The fourth proportional to 1,040.40, 1,435.95 and 667.85 is: 921.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.40 : 1,435.95 = 667.85 : x
  2. Step 2: Convert to fraction form
    1,040.40/1,435.95 = 667.85/x
  3. Step 3: Cross multiply
    1,040.40x = 1,435.95 × 667.85
  4. Step 4: Simplify right side
    1,040.40x = 958,996.07
  5. Step 5: Solve for x
    x = 958,996.07/1,040.40
  6. Step 6: Final answer
    x = 921.76

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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.