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Finding the Fourth Proportional to 991.41, 1,487.46 and 663.66

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Solution

The fourth proportional to 991.41, 1,487.46 and 663.66 is: 995.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.41 : 1,487.46 = 663.66 : x
  2. Step 2: Convert to fraction form
    991.41/1,487.46 = 663.66/x
  3. Step 3: Cross multiply
    991.41x = 1,487.46 × 663.66
  4. Step 4: Simplify right side
    991.41x = 987,167.70
  5. Step 5: Solve for x
    x = 987,167.70/991.41
  6. Step 6: Final answer
    x = 995.72

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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.