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Finding the Fourth Proportional to 727.48, 1,003.49 and 628.31

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Solution

The fourth proportional to 727.48, 1,003.49 and 628.31 is: 866.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.48 : 1,003.49 = 628.31 : x
  2. Step 2: Convert to fraction form
    727.48/1,003.49 = 628.31/x
  3. Step 3: Cross multiply
    727.48x = 1,003.49 × 628.31
  4. Step 4: Simplify right side
    727.48x = 630,498.88
  5. Step 5: Solve for x
    x = 630,498.88/727.48
  6. Step 6: Final answer
    x = 866.69

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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.