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Finding the Fourth Proportional to 992.79, 1,489.14 and 376.92

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Solution

The fourth proportional to 992.79, 1,489.14 and 376.92 is: 565.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.79 : 1,489.14 = 376.92 : x
  2. Step 2: Convert to fraction form
    992.79/1,489.14 = 376.92/x
  3. Step 3: Cross multiply
    992.79x = 1,489.14 × 376.92
  4. Step 4: Simplify right side
    992.79x = 561,286.65
  5. Step 5: Solve for x
    x = 561,286.65/992.79
  6. Step 6: Final answer
    x = 565.36

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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.