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Finding the Fourth Proportional to 909.13, 1,361.55 and 445.45

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Solution

The fourth proportional to 909.13, 1,361.55 and 445.45 is: 667.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.13 : 1,361.55 = 445.45 : x
  2. Step 2: Convert to fraction form
    909.13/1,361.55 = 445.45/x
  3. Step 3: Cross multiply
    909.13x = 1,361.55 × 445.45
  4. Step 4: Simplify right side
    909.13x = 606,502.45
  5. Step 5: Solve for x
    x = 606,502.45/909.13
  6. Step 6: Final answer
    x = 667.12

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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.