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Finding the Fourth Proportional to 907.85, 1,361.70 and 330.32

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Solution

The fourth proportional to 907.85, 1,361.70 and 330.32 is: 495.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.85 : 1,361.70 = 330.32 : x
  2. Step 2: Convert to fraction form
    907.85/1,361.70 = 330.32/x
  3. Step 3: Cross multiply
    907.85x = 1,361.70 × 330.32
  4. Step 4: Simplify right side
    907.85x = 449,789.94
  5. Step 5: Solve for x
    x = 449,789.94/907.85
  6. Step 6: Final answer
    x = 495.45

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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.