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Finding the Fourth Proportional to 1,249.16, 1,721.94 and 854.96

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Solution

The fourth proportional to 1,249.16, 1,721.94 and 854.96 is: 1,178.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.16 : 1,721.94 = 854.96 : x
  2. Step 2: Convert to fraction form
    1,249.16/1,721.94 = 854.96/x
  3. Step 3: Cross multiply
    1,249.16x = 1,721.94 × 854.96
  4. Step 4: Simplify right side
    1,249.16x = 1,472,189.82
  5. Step 5: Solve for x
    x = 1,472,189.82/1,249.16
  6. Step 6: Final answer
    x = 1,178.54

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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.