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Finding the Fourth Proportional to 716.80, 988.55 and 517.58

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Solution

The fourth proportional to 716.80, 988.55 and 517.58 is: 713.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.80 : 988.55 = 517.58 : x
  2. Step 2: Convert to fraction form
    716.80/988.55 = 517.58/x
  3. Step 3: Cross multiply
    716.80x = 988.55 × 517.58
  4. Step 4: Simplify right side
    716.80x = 511,646.18
  5. Step 5: Solve for x
    x = 511,646.18/716.80
  6. Step 6: Final answer
    x = 713.79

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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.