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Finding the Fourth Proportional to 1,078.71, 1,616.85 and 531.28

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Solution

The fourth proportional to 1,078.71, 1,616.85 and 531.28 is: 796.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.71 : 1,616.85 = 531.28 : x
  2. Step 2: Convert to fraction form
    1,078.71/1,616.85 = 531.28/x
  3. Step 3: Cross multiply
    1,078.71x = 1,616.85 × 531.28
  4. Step 4: Simplify right side
    1,078.71x = 858,996.03
  5. Step 5: Solve for x
    x = 858,996.03/1,078.71
  6. Step 6: Final answer
    x = 796.32

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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.