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Finding the Fourth Proportional to 727.28, 1,003.64 and 395.72

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Solution

The fourth proportional to 727.28, 1,003.64 and 395.72 is: 546.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.28 : 1,003.64 = 395.72 : x
  2. Step 2: Convert to fraction form
    727.28/1,003.64 = 395.72/x
  3. Step 3: Cross multiply
    727.28x = 1,003.64 × 395.72
  4. Step 4: Simplify right side
    727.28x = 397,158.30
  5. Step 5: Solve for x
    x = 397,158.30/727.28
  6. Step 6: Final answer
    x = 546.08

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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.