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Finding the Fourth Proportional to 716.82, 989.78 and 550.78

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Solution

The fourth proportional to 716.82, 989.78 and 550.78 is: 760.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.82 : 989.78 = 550.78 : x
  2. Step 2: Convert to fraction form
    716.82/989.78 = 550.78/x
  3. Step 3: Cross multiply
    716.82x = 989.78 × 550.78
  4. Step 4: Simplify right side
    716.82x = 545,151.03
  5. Step 5: Solve for x
    x = 545,151.03/716.82
  6. Step 6: Final answer
    x = 760.51

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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.