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Finding the Fourth Proportional to 993.23, 1,489.91 and 262.79

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Solution

The fourth proportional to 993.23, 1,489.91 and 262.79 is: 394.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.23 : 1,489.91 = 262.79 : x
  2. Step 2: Convert to fraction form
    993.23/1,489.91 = 262.79/x
  3. Step 3: Cross multiply
    993.23x = 1,489.91 × 262.79
  4. Step 4: Simplify right side
    993.23x = 391,524.69
  5. Step 5: Solve for x
    x = 391,524.69/993.23
  6. Step 6: Final answer
    x = 394.20

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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.