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Finding the Fourth Proportional to 728.07, 1,004.76 and 396.51

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Solution

The fourth proportional to 728.07, 1,004.76 and 396.51 is: 547.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.07 : 1,004.76 = 396.51 : x
  2. Step 2: Convert to fraction form
    728.07/1,004.76 = 396.51/x
  3. Step 3: Cross multiply
    728.07x = 1,004.76 × 396.51
  4. Step 4: Simplify right side
    728.07x = 398,397.39
  5. Step 5: Solve for x
    x = 398,397.39/728.07
  6. Step 6: Final answer
    x = 547.20

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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.