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Finding the Fourth Proportional to 664.61, 995.99 and 339.59

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Solution

The fourth proportional to 664.61, 995.99 and 339.59 is: 508.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.61 : 995.99 = 339.59 : x
  2. Step 2: Convert to fraction form
    664.61/995.99 = 339.59/x
  3. Step 3: Cross multiply
    664.61x = 995.99 × 339.59
  4. Step 4: Simplify right side
    664.61x = 338,221.57
  5. Step 5: Solve for x
    x = 338,221.57/664.61
  6. Step 6: Final answer
    x = 508.91

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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.