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Finding the Fourth Proportional to 1,205.10, 1,662.90 and 681

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Solution

The fourth proportional to 1,205.10, 1,662.90 and 681 is: 939.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.10 : 1,662.90 = 681 : x
  2. Step 2: Convert to fraction form
    1,205.10/1,662.90 = 681/x
  3. Step 3: Cross multiply
    1,205.10x = 1,662.90 × 681
  4. Step 4: Simplify right side
    1,205.10x = 1,132,434.90
  5. Step 5: Solve for x
    x = 1,132,434.90/1,205.10
  6. Step 6: Final answer
    x = 939.70

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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.