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Finding the Fourth Proportional to 1,040.28, 1,435.66 and 667.24

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Solution

The fourth proportional to 1,040.28, 1,435.66 and 667.24 is: 920.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.28 : 1,435.66 = 667.24 : x
  2. Step 2: Convert to fraction form
    1,040.28/1,435.66 = 667.24/x
  3. Step 3: Cross multiply
    1,040.28x = 1,435.66 × 667.24
  4. Step 4: Simplify right side
    1,040.28x = 957,929.78
  5. Step 5: Solve for x
    x = 957,929.78/1,040.28
  6. Step 6: Final answer
    x = 920.84

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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.