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Finding the Fourth Proportional to 992.25, 1,488.38 and 261.83

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Solution

The fourth proportional to 992.25, 1,488.38 and 261.83 is: 392.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.25 : 1,488.38 = 261.83 : x
  2. Step 2: Convert to fraction form
    992.25/1,488.38 = 261.83/x
  3. Step 3: Cross multiply
    992.25x = 1,488.38 × 261.83
  4. Step 4: Simplify right side
    992.25x = 389,704.95
  5. Step 5: Solve for x
    x = 389,704.95/992.25
  6. Step 6: Final answer
    x = 392.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.