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Finding the Fourth Proportional to 939.76, 1,408.04 and 664.50

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Solution

The fourth proportional to 939.76, 1,408.04 and 664.50 is: 995.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.76 : 1,408.04 = 664.50 : x
  2. Step 2: Convert to fraction form
    939.76/1,408.04 = 664.50/x
  3. Step 3: Cross multiply
    939.76x = 1,408.04 × 664.50
  4. Step 4: Simplify right side
    939.76x = 935,639.26
  5. Step 5: Solve for x
    x = 935,639.26/939.76
  6. Step 6: Final answer
    x = 995.62

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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.