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Finding the Fourth Proportional to 662.78, 996.60 and 458.66

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Solution

The fourth proportional to 662.78, 996.60 and 458.66 is: 689.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.78 : 996.60 = 458.66 : x
  2. Step 2: Convert to fraction form
    662.78/996.60 = 458.66/x
  3. Step 3: Cross multiply
    662.78x = 996.60 × 458.66
  4. Step 4: Simplify right side
    662.78x = 457,104.77
  5. Step 5: Solve for x
    x = 457,104.77/662.78
  6. Step 6: Final answer
    x = 689.68

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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.