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Finding the Fourth Proportional to 992.33, 1,488.49 and 261.89

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Solution

The fourth proportional to 992.33, 1,488.49 and 261.89 is: 392.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.33 : 1,488.49 = 261.89 : x
  2. Step 2: Convert to fraction form
    992.33/1,488.49 = 261.89/x
  3. Step 3: Cross multiply
    992.33x = 1,488.49 × 261.89
  4. Step 4: Simplify right side
    992.33x = 389,823.71
  5. Step 5: Solve for x
    x = 389,823.71/992.33
  6. Step 6: Final answer
    x = 392.84

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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.