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Finding the Fourth Proportional to 907.34, 1,361.69 and 664.49

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Solution

The fourth proportional to 907.34, 1,361.69 and 664.49 is: 997.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.34 : 1,361.69 = 664.49 : x
  2. Step 2: Convert to fraction form
    907.34/1,361.69 = 664.49/x
  3. Step 3: Cross multiply
    907.34x = 1,361.69 × 664.49
  4. Step 4: Simplify right side
    907.34x = 904,829.39
  5. Step 5: Solve for x
    x = 904,829.39/907.34
  6. Step 6: Final answer
    x = 997.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.