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Finding the Fourth Proportional to 1,138.73, 1,706.87 and 813.11

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Solution

The fourth proportional to 1,138.73, 1,706.87 and 813.11 is: 1,218.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.73 : 1,706.87 = 813.11 : x
  2. Step 2: Convert to fraction form
    1,138.73/1,706.87 = 813.11/x
  3. Step 3: Cross multiply
    1,138.73x = 1,706.87 × 813.11
  4. Step 4: Simplify right side
    1,138.73x = 1,387,863.51
  5. Step 5: Solve for x
    x = 1,387,863.51/1,138.73
  6. Step 6: Final answer
    x = 1,218.79

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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.