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Finding the Fourth Proportional to 1,040.68, 1,436.04 and 667.64

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Solution

The fourth proportional to 1,040.68, 1,436.04 and 667.64 is: 921.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.68 : 1,436.04 = 667.64 : x
  2. Step 2: Convert to fraction form
    1,040.68/1,436.04 = 667.64/x
  3. Step 3: Cross multiply
    1,040.68x = 1,436.04 × 667.64
  4. Step 4: Simplify right side
    1,040.68x = 958,757.75
  5. Step 5: Solve for x
    x = 958,757.75/1,040.68
  6. Step 6: Final answer
    x = 921.28

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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.