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Finding the Fourth Proportional to 757.53, 1,134.49 and 427.66

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Solution

The fourth proportional to 757.53, 1,134.49 and 427.66 is: 640.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.53 : 1,134.49 = 427.66 : x
  2. Step 2: Convert to fraction form
    757.53/1,134.49 = 427.66/x
  3. Step 3: Cross multiply
    757.53x = 1,134.49 × 427.66
  4. Step 4: Simplify right side
    757.53x = 485,175.99
  5. Step 5: Solve for x
    x = 485,175.99/757.53
  6. Step 6: Final answer
    x = 640.47

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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.