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Finding the Fourth Proportional to 1,230.73, 1,696.29 and 993.80

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Solution

The fourth proportional to 1,230.73, 1,696.29 and 993.80 is: 1,369.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.73 : 1,696.29 = 993.80 : x
  2. Step 2: Convert to fraction form
    1,230.73/1,696.29 = 993.80/x
  3. Step 3: Cross multiply
    1,230.73x = 1,696.29 × 993.80
  4. Step 4: Simplify right side
    1,230.73x = 1,685,773.52
  5. Step 5: Solve for x
    x = 1,685,773.52/1,230.73
  6. Step 6: Final answer
    x = 1,369.74

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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.