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Finding the Fourth Proportional to 731.21, 1,009.01 and 399.63

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Solution

The fourth proportional to 731.21, 1,009.01 and 399.63 is: 551.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.21 : 1,009.01 = 399.63 : x
  2. Step 2: Convert to fraction form
    731.21/1,009.01 = 399.63/x
  3. Step 3: Cross multiply
    731.21x = 1,009.01 × 399.63
  4. Step 4: Simplify right side
    731.21x = 403,230.67
  5. Step 5: Solve for x
    x = 403,230.67/731.21
  6. Step 6: Final answer
    x = 551.46

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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.