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Finding the Fourth Proportional to 1,230.40, 1,696.96 and 994.28

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Solution

The fourth proportional to 1,230.40, 1,696.96 and 994.28 is: 1,371.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.40 : 1,696.96 = 994.28 : x
  2. Step 2: Convert to fraction form
    1,230.40/1,696.96 = 994.28/x
  3. Step 3: Cross multiply
    1,230.40x = 1,696.96 × 994.28
  4. Step 4: Simplify right side
    1,230.40x = 1,687,253.39
  5. Step 5: Solve for x
    x = 1,687,253.39/1,230.40
  6. Step 6: Final answer
    x = 1,371.30

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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.