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Finding the Fourth Proportional to 727.76, 1,004.28 and 396.20

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Solution

The fourth proportional to 727.76, 1,004.28 and 396.20 is: 546.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.76 : 1,004.28 = 396.20 : x
  2. Step 2: Convert to fraction form
    727.76/1,004.28 = 396.20/x
  3. Step 3: Cross multiply
    727.76x = 1,004.28 × 396.20
  4. Step 4: Simplify right side
    727.76x = 397,890.71
  5. Step 5: Solve for x
    x = 397,890.71/727.76
  6. Step 6: Final answer
    x = 546.74

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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.