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Finding the Fourth Proportional to 1,213.92, 1,819.50 and 666.36

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Solution

The fourth proportional to 1,213.92, 1,819.50 and 666.36 is: 998.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.92 : 1,819.50 = 666.36 : x
  2. Step 2: Convert to fraction form
    1,213.92/1,819.50 = 666.36/x
  3. Step 3: Cross multiply
    1,213.92x = 1,819.50 × 666.36
  4. Step 4: Simplify right side
    1,213.92x = 1,212,442.02
  5. Step 5: Solve for x
    x = 1,212,442.02/1,213.92
  6. Step 6: Final answer
    x = 998.78

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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.