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Finding the Fourth Proportional to 661.60, 991.88 and 327.92

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Solution

The fourth proportional to 661.60, 991.88 and 327.92 is: 491.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.60 : 991.88 = 327.92 : x
  2. Step 2: Convert to fraction form
    661.60/991.88 = 327.92/x
  3. Step 3: Cross multiply
    661.60x = 991.88 × 327.92
  4. Step 4: Simplify right side
    661.60x = 325,251.92
  5. Step 5: Solve for x
    x = 325,251.92/661.60
  6. Step 6: Final answer
    x = 491.61

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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.