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Finding the Fourth Proportional to 992.78, 1,369.89 and 550.71

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Solution

The fourth proportional to 992.78, 1,369.89 and 550.71 is: 759.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.78 : 1,369.89 = 550.71 : x
  2. Step 2: Convert to fraction form
    992.78/1,369.89 = 550.71/x
  3. Step 3: Cross multiply
    992.78x = 1,369.89 × 550.71
  4. Step 4: Simplify right side
    992.78x = 754,412.12
  5. Step 5: Solve for x
    x = 754,412.12/992.78
  6. Step 6: Final answer
    x = 759.90

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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.