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Finding the Fourth Proportional to 908.40, 1,361.70 and 445.80

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Solution

The fourth proportional to 908.40, 1,361.70 and 445.80 is: 668.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.40 : 1,361.70 = 445.80 : x
  2. Step 2: Convert to fraction form
    908.40/1,361.70 = 445.80/x
  3. Step 3: Cross multiply
    908.40x = 1,361.70 × 445.80
  4. Step 4: Simplify right side
    908.40x = 607,045.86
  5. Step 5: Solve for x
    x = 607,045.86/908.40
  6. Step 6: Final answer
    x = 668.26

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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.