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Finding the Fourth Proportional to 716.80, 987.78 and 551.02

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Solution

The fourth proportional to 716.80, 987.78 and 551.02 is: 759.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.80 : 987.78 = 551.02 : x
  2. Step 2: Convert to fraction form
    716.80/987.78 = 551.02/x
  3. Step 3: Cross multiply
    716.80x = 987.78 × 551.02
  4. Step 4: Simplify right side
    716.80x = 544,286.54
  5. Step 5: Solve for x
    x = 544,286.54/716.80
  6. Step 6: Final answer
    x = 759.33

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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.