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Finding the Fourth Proportional to 1,002.69, 1,383.19 and 628.97

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Solution

The fourth proportional to 1,002.69, 1,383.19 and 628.97 is: 867.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.69 : 1,383.19 = 628.97 : x
  2. Step 2: Convert to fraction form
    1,002.69/1,383.19 = 628.97/x
  3. Step 3: Cross multiply
    1,002.69x = 1,383.19 × 628.97
  4. Step 4: Simplify right side
    1,002.69x = 869,976.53
  5. Step 5: Solve for x
    x = 869,976.53/1,002.69
  6. Step 6: Final answer
    x = 867.64

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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.