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Finding the Fourth Proportional to 907.43, 1,361.27 and 445.22

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Solution

The fourth proportional to 907.43, 1,361.27 and 445.22 is: 667.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.43 : 1,361.27 = 445.22 : x
  2. Step 2: Convert to fraction form
    907.43/1,361.27 = 445.22/x
  3. Step 3: Cross multiply
    907.43x = 1,361.27 × 445.22
  4. Step 4: Simplify right side
    907.43x = 606,065.81
  5. Step 5: Solve for x
    x = 606,065.81/907.43
  6. Step 6: Final answer
    x = 667.89

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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.