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Finding the Fourth Proportional to 992.65, 1,369.74 and 550.47

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Solution

The fourth proportional to 992.65, 1,369.74 and 550.47 is: 759.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.65 : 1,369.74 = 550.47 : x
  2. Step 2: Convert to fraction form
    992.65/1,369.74 = 550.47/x
  3. Step 3: Cross multiply
    992.65x = 1,369.74 × 550.47
  4. Step 4: Simplify right side
    992.65x = 754,000.78
  5. Step 5: Solve for x
    x = 754,000.78/992.65
  6. Step 6: Final answer
    x = 759.58

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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.