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Finding the Fourth Proportional to 909.26, 1,361.76 and 447.35

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Solution

The fourth proportional to 909.26, 1,361.76 and 447.35 is: 669.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.26 : 1,361.76 = 447.35 : x
  2. Step 2: Convert to fraction form
    909.26/1,361.76 = 447.35/x
  3. Step 3: Cross multiply
    909.26x = 1,361.76 × 447.35
  4. Step 4: Simplify right side
    909.26x = 609,183.34
  5. Step 5: Solve for x
    x = 609,183.34/909.26
  6. Step 6: Final answer
    x = 669.98

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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.