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Finding the Fourth Proportional to 1,002.11, 1,381.86 and 628.97

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Solution

The fourth proportional to 1,002.11, 1,381.86 and 628.97 is: 867.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.11 : 1,381.86 = 628.97 : x
  2. Step 2: Convert to fraction form
    1,002.11/1,381.86 = 628.97/x
  3. Step 3: Cross multiply
    1,002.11x = 1,381.86 × 628.97
  4. Step 4: Simplify right side
    1,002.11x = 869,141.57
  5. Step 5: Solve for x
    x = 869,141.57/1,002.11
  6. Step 6: Final answer
    x = 867.32

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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.