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Finding the Fourth Proportional to 729.76, 1,007.04 and 398.20

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Solution

The fourth proportional to 729.76, 1,007.04 and 398.20 is: 549.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.76 : 1,007.04 = 398.20 : x
  2. Step 2: Convert to fraction form
    729.76/1,007.04 = 398.20/x
  3. Step 3: Cross multiply
    729.76x = 1,007.04 × 398.20
  4. Step 4: Simplify right side
    729.76x = 401,003.33
  5. Step 5: Solve for x
    x = 401,003.33/729.76
  6. Step 6: Final answer
    x = 549.50

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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.