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Finding the Fourth Proportional to 731.05, 1,008.85 and 399.48

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Solution

The fourth proportional to 731.05, 1,008.85 and 399.48 is: 551.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.05 : 1,008.85 = 399.48 : x
  2. Step 2: Convert to fraction form
    731.05/1,008.85 = 399.48/x
  3. Step 3: Cross multiply
    731.05x = 1,008.85 × 399.48
  4. Step 4: Simplify right side
    731.05x = 403,015.40
  5. Step 5: Solve for x
    x = 403,015.40/731.05
  6. Step 6: Final answer
    x = 551.28

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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.