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Finding the Fourth Proportional to 664.60, 996.90 and 339.52

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Solution

The fourth proportional to 664.60, 996.90 and 339.52 is: 509.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.60 : 996.90 = 339.52 : x
  2. Step 2: Convert to fraction form
    664.60/996.90 = 339.52/x
  3. Step 3: Cross multiply
    664.60x = 996.90 × 339.52
  4. Step 4: Simplify right side
    664.60x = 338,467.49
  5. Step 5: Solve for x
    x = 338,467.49/664.60
  6. Step 6: Final answer
    x = 509.28

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Double scale
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Similar ratio
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1.5x scale

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.