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Finding the Fourth Proportional to 727.11, 1,003.86 and 628.65

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Solution

The fourth proportional to 727.11, 1,003.86 and 628.65 is: 867.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.11 : 1,003.86 = 628.65 : x
  2. Step 2: Convert to fraction form
    727.11/1,003.86 = 628.65/x
  3. Step 3: Cross multiply
    727.11x = 1,003.86 × 628.65
  4. Step 4: Simplify right side
    727.11x = 631,076.59
  5. Step 5: Solve for x
    x = 631,076.59/727.11
  6. Step 6: Final answer
    x = 867.92

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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.