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Finding the Fourth Proportional to 727.08, 1,003.35 and 395.50

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Solution

The fourth proportional to 727.08, 1,003.35 and 395.50 is: 545.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.08 : 1,003.35 = 395.50 : x
  2. Step 2: Convert to fraction form
    727.08/1,003.35 = 395.50/x
  3. Step 3: Cross multiply
    727.08x = 1,003.35 × 395.50
  4. Step 4: Simplify right side
    727.08x = 396,825.78
  5. Step 5: Solve for x
    x = 396,825.78/727.08
  6. Step 6: Final answer
    x = 545.78

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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.