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Finding the Fourth Proportional to 716.80, 989.46 and 616.85

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Solution

The fourth proportional to 716.80, 989.46 and 616.85 is: 851.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.80 : 989.46 = 616.85 : x
  2. Step 2: Convert to fraction form
    716.80/989.46 = 616.85/x
  3. Step 3: Cross multiply
    716.80x = 989.46 × 616.85
  4. Step 4: Simplify right side
    716.80x = 610,340.37
  5. Step 5: Solve for x
    x = 610,340.37/716.80
  6. Step 6: Final answer
    x = 851.48

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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.