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Finding the Fourth Proportional to 881.78, 1,321.45 and 665.10

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Solution

The fourth proportional to 881.78, 1,321.45 and 665.10 is: 996.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.78 : 1,321.45 = 665.10 : x
  2. Step 2: Convert to fraction form
    881.78/1,321.45 = 665.10/x
  3. Step 3: Cross multiply
    881.78x = 1,321.45 × 665.10
  4. Step 4: Simplify right side
    881.78x = 878,894.73
  5. Step 5: Solve for x
    x = 878,894.73/881.78
  6. Step 6: Final answer
    x = 996.73

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Double scale
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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.