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Finding the Fourth Proportional to 731.15, 1,009 and 399.59

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Solution

The fourth proportional to 731.15, 1,009 and 399.59 is: 551.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.15 : 1,009 = 399.59 : x
  2. Step 2: Convert to fraction form
    731.15/1,009 = 399.59/x
  3. Step 3: Cross multiply
    731.15x = 1,009 × 399.59
  4. Step 4: Simplify right side
    731.15x = 403,186.31
  5. Step 5: Solve for x
    x = 403,186.31/731.15
  6. Step 6: Final answer
    x = 551.44

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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.