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Finding the Fourth Proportional to 731.00, 1,008.80 and 399.43

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Solution

The fourth proportional to 731.00, 1,008.80 and 399.43 is: 551.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.00 : 1,008.80 = 399.43 : x
  2. Step 2: Convert to fraction form
    731.00/1,008.80 = 399.43/x
  3. Step 3: Cross multiply
    731.00x = 1,008.80 × 399.43
  4. Step 4: Simplify right side
    731.00x = 402,947.99
  5. Step 5: Solve for x
    x = 402,947.99/731.00
  6. Step 6: Final answer
    x = 551.23

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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.