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Finding the Fourth Proportional to 716.82, 1,078.89 and 611.10

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Solution

The fourth proportional to 716.82, 1,078.89 and 611.10 is: 919.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.82 : 1,078.89 = 611.10 : x
  2. Step 2: Convert to fraction form
    716.82/1,078.89 = 611.10/x
  3. Step 3: Cross multiply
    716.82x = 1,078.89 × 611.10
  4. Step 4: Simplify right side
    716.82x = 659,309.68
  5. Step 5: Solve for x
    x = 659,309.68/716.82
  6. Step 6: Final answer
    x = 919.77

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.