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Finding the Fourth Proportional to 1,229.77, 1,697.78 and 949.42

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Solution

The fourth proportional to 1,229.77, 1,697.78 and 949.42 is: 1,310.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.77 : 1,697.78 = 949.42 : x
  2. Step 2: Convert to fraction form
    1,229.77/1,697.78 = 949.42/x
  3. Step 3: Cross multiply
    1,229.77x = 1,697.78 × 949.42
  4. Step 4: Simplify right side
    1,229.77x = 1,611,904.42
  5. Step 5: Solve for x
    x = 1,611,904.42/1,229.77
  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.