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Finding the Fourth Proportional to 992.40, 1,369.47 and 550.27

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Solution

The fourth proportional to 992.40, 1,369.47 and 550.27 is: 759.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.40 : 1,369.47 = 550.27 : x
  2. Step 2: Convert to fraction form
    992.40/1,369.47 = 550.27/x
  3. Step 3: Cross multiply
    992.40x = 1,369.47 × 550.27
  4. Step 4: Simplify right side
    992.40x = 753,578.26
  5. Step 5: Solve for x
    x = 753,578.26/992.40
  6. Step 6: Final answer
    x = 759.35

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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.