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Finding the Fourth Proportional to 1,371.92, 1,891.55 and 1,172.39

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Solution

The fourth proportional to 1,371.92, 1,891.55 and 1,172.39 is: 1,616.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.92 : 1,891.55 = 1,172.39 : x
  2. Step 2: Convert to fraction form
    1,371.92/1,891.55 = 1,172.39/x
  3. Step 3: Cross multiply
    1,371.92x = 1,891.55 × 1,172.39
  4. Step 4: Simplify right side
    1,371.92x = 2,217,627.78
  5. Step 5: Solve for x
    x = 2,217,627.78/1,371.92
  6. Step 6: Final answer
    x = 1,616.45

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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.