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Finding the Fourth Proportional to 993.13, 1,489.73 and 262.78

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Solution

The fourth proportional to 993.13, 1,489.73 and 262.78 is: 394.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.13 : 1,489.73 = 262.78 : x
  2. Step 2: Convert to fraction form
    993.13/1,489.73 = 262.78/x
  3. Step 3: Cross multiply
    993.13x = 1,489.73 × 262.78
  4. Step 4: Simplify right side
    993.13x = 391,466.21
  5. Step 5: Solve for x
    x = 391,466.21/993.13
  6. Step 6: Final answer
    x = 394.18

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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.