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Finding the Fourth Proportional to 1,371.24, 1,891.78 and 873.79

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Solution

The fourth proportional to 1,371.24, 1,891.78 and 873.79 is: 1,205.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.24 : 1,891.78 = 873.79 : x
  2. Step 2: Convert to fraction form
    1,371.24/1,891.78 = 873.79/x
  3. Step 3: Cross multiply
    1,371.24x = 1,891.78 × 873.79
  4. Step 4: Simplify right side
    1,371.24x = 1,653,018.45
  5. Step 5: Solve for x
    x = 1,653,018.45/1,371.24
  6. Step 6: Final answer
    x = 1,205.49

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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.