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Finding the Fourth Proportional to 909.38, 1,361.99 and 543.42

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Solution

The fourth proportional to 909.38, 1,361.99 and 543.42 is: 813.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.38 : 1,361.99 = 543.42 : x
  2. Step 2: Convert to fraction form
    909.38/1,361.99 = 543.42/x
  3. Step 3: Cross multiply
    909.38x = 1,361.99 × 543.42
  4. Step 4: Simplify right side
    909.38x = 740,128.86
  5. Step 5: Solve for x
    x = 740,128.86/909.38
  6. Step 6: Final answer
    x = 813.88

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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.