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Finding the Fourth Proportional to 656.47, 905.99 and 490.39

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Solution

The fourth proportional to 656.47, 905.99 and 490.39 is: 676.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.47 : 905.99 = 490.39 : x
  2. Step 2: Convert to fraction form
    656.47/905.99 = 490.39/x
  3. Step 3: Cross multiply
    656.47x = 905.99 × 490.39
  4. Step 4: Simplify right side
    656.47x = 444,285.98
  5. Step 5: Solve for x
    x = 444,285.98/656.47
  6. Step 6: Final answer
    x = 676.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.