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Finding the Fourth Proportional to 995.10, 1,371.94 and 640.39

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Solution

The fourth proportional to 995.10, 1,371.94 and 640.39 is: 882.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.10 : 1,371.94 = 640.39 : x
  2. Step 2: Convert to fraction form
    995.10/1,371.94 = 640.39/x
  3. Step 3: Cross multiply
    995.10x = 1,371.94 × 640.39
  4. Step 4: Simplify right side
    995.10x = 878,576.66
  5. Step 5: Solve for x
    x = 878,576.66/995.10
  6. Step 6: Final answer
    x = 882.90

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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.