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Finding the Fourth Proportional to 1,243.51, 1,863.61 and 658.39

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Solution

The fourth proportional to 1,243.51, 1,863.61 and 658.39 is: 986.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.51 : 1,863.61 = 658.39 : x
  2. Step 2: Convert to fraction form
    1,243.51/1,863.61 = 658.39/x
  3. Step 3: Cross multiply
    1,243.51x = 1,863.61 × 658.39
  4. Step 4: Simplify right side
    1,243.51x = 1,226,982.19
  5. Step 5: Solve for x
    x = 1,226,982.19/1,243.51
  6. Step 6: Final answer
    x = 986.71

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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.