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Finding the Fourth Proportional to 996.10, 1,373.32 and 641.39

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Solution

The fourth proportional to 996.10, 1,373.32 and 641.39 is: 884.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.10 : 1,373.32 = 641.39 : x
  2. Step 2: Convert to fraction form
    996.10/1,373.32 = 641.39/x
  3. Step 3: Cross multiply
    996.10x = 1,373.32 × 641.39
  4. Step 4: Simplify right side
    996.10x = 880,833.71
  5. Step 5: Solve for x
    x = 880,833.71/996.10
  6. Step 6: Final answer
    x = 884.28

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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.