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Finding the Fourth Proportional to 1,138.43, 1,564.22 and 905.15

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Solution

The fourth proportional to 1,138.43, 1,564.22 and 905.15 is: 1,243.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.43 : 1,564.22 = 905.15 : x
  2. Step 2: Convert to fraction form
    1,138.43/1,564.22 = 905.15/x
  3. Step 3: Cross multiply
    1,138.43x = 1,564.22 × 905.15
  4. Step 4: Simplify right side
    1,138.43x = 1,415,853.73
  5. Step 5: Solve for x
    x = 1,415,853.73/1,138.43
  6. Step 6: Final answer
    x = 1,243.69

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.