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Finding the Fourth Proportional to 992.55, 1,369.80 and 550.59

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Solution

The fourth proportional to 992.55, 1,369.80 and 550.59 is: 759.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.55 : 1,369.80 = 550.59 : x
  2. Step 2: Convert to fraction form
    992.55/1,369.80 = 550.59/x
  3. Step 3: Cross multiply
    992.55x = 1,369.80 × 550.59
  4. Step 4: Simplify right side
    992.55x = 754,191.33
  5. Step 5: Solve for x
    x = 754,191.33/992.55
  6. Step 6: Final answer
    x = 759.85

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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.