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Finding the Fourth Proportional to 911.99, 1,366.16 and 819.79

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Solution

The fourth proportional to 911.99, 1,366.16 and 819.79 is: 1,228.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.99 : 1,366.16 = 819.79 : x
  2. Step 2: Convert to fraction form
    911.99/1,366.16 = 819.79/x
  3. Step 3: Cross multiply
    911.99x = 1,366.16 × 819.79
  4. Step 4: Simplify right side
    911.99x = 1,119,956.79
  5. Step 5: Solve for x
    x = 1,119,956.79/911.99
  6. Step 6: Final answer
    x = 1,228.03

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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.