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Finding the Fourth Proportional to 1,139.08, 1,571.97 and 634.96

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Solution

The fourth proportional to 1,139.08, 1,571.97 and 634.96 is: 876.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.08 : 1,571.97 = 634.96 : x
  2. Step 2: Convert to fraction form
    1,139.08/1,571.97 = 634.96/x
  3. Step 3: Cross multiply
    1,139.08x = 1,571.97 × 634.96
  4. Step 4: Simplify right side
    1,139.08x = 998,138.07
  5. Step 5: Solve for x
    x = 998,138.07/1,139.08
  6. Step 6: Final answer
    x = 876.27

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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.