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Finding the Fourth Proportional to 727.32, 1,003.69 and 395.75

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Solution

The fourth proportional to 727.32, 1,003.69 and 395.75 is: 546.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.32 : 1,003.69 = 395.75 : x
  2. Step 2: Convert to fraction form
    727.32/1,003.69 = 395.75/x
  3. Step 3: Cross multiply
    727.32x = 1,003.69 × 395.75
  4. Step 4: Simplify right side
    727.32x = 397,213.32
  5. Step 5: Solve for x
    x = 397,213.32/727.32
  6. Step 6: Final answer
    x = 546.13

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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.