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Finding the Fourth Proportional to 992.78, 1,488.33 and 408.06

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Solution

The fourth proportional to 992.78, 1,488.33 and 408.06 is: 611.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.78 : 1,488.33 = 408.06 : x
  2. Step 2: Convert to fraction form
    992.78/1,488.33 = 408.06/x
  3. Step 3: Cross multiply
    992.78x = 1,488.33 × 408.06
  4. Step 4: Simplify right side
    992.78x = 607,327.94
  5. Step 5: Solve for x
    x = 607,327.94/992.78
  6. Step 6: Final answer
    x = 611.75

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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.