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Finding the Fourth Proportional to 995.11, 1,371.79 and 621.92

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Solution

The fourth proportional to 995.11, 1,371.79 and 621.92 is: 857.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.11 : 1,371.79 = 621.92 : x
  2. Step 2: Convert to fraction form
    995.11/1,371.79 = 621.92/x
  3. Step 3: Cross multiply
    995.11x = 1,371.79 × 621.92
  4. Step 4: Simplify right side
    995.11x = 853,143.64
  5. Step 5: Solve for x
    x = 853,143.64/995.11
  6. Step 6: Final answer
    x = 857.34

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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.