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Finding the Fourth Proportional to 728.19, 1,004.91 and 396.63

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Solution

The fourth proportional to 728.19, 1,004.91 and 396.63 is: 547.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.19 : 1,004.91 = 396.63 : x
  2. Step 2: Convert to fraction form
    728.19/1,004.91 = 396.63/x
  3. Step 3: Cross multiply
    728.19x = 1,004.91 × 396.63
  4. Step 4: Simplify right side
    728.19x = 398,577.45
  5. Step 5: Solve for x
    x = 398,577.45/728.19
  6. Step 6: Final answer
    x = 547.35

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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.