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Finding the Fourth Proportional to 731.10, 1,008.95 and 399.56

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Solution

The fourth proportional to 731.10, 1,008.95 and 399.56 is: 551.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.10 : 1,008.95 = 399.56 : x
  2. Step 2: Convert to fraction form
    731.10/1,008.95 = 399.56/x
  3. Step 3: Cross multiply
    731.10x = 1,008.95 × 399.56
  4. Step 4: Simplify right side
    731.10x = 403,136.06
  5. Step 5: Solve for x
    x = 403,136.06/731.10
  6. Step 6: Final answer
    x = 551.41

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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.