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Finding the Fourth Proportional to 1,229.76, 1,697.79 and 949.41

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Solution

The fourth proportional to 1,229.76, 1,697.79 and 949.41 is: 1,310.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.76 : 1,697.79 = 949.41 : x
  2. Step 2: Convert to fraction form
    1,229.76/1,697.79 = 949.41/x
  3. Step 3: Cross multiply
    1,229.76x = 1,697.79 × 949.41
  4. Step 4: Simplify right side
    1,229.76x = 1,611,898.80
  5. Step 5: Solve for x
    x = 1,611,898.80/1,229.76
  6. Step 6: Final answer
    x = 1,310.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.