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Finding the Fourth Proportional to 754.43, 1,126.69 and 643.56

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Solution

The fourth proportional to 754.43, 1,126.69 and 643.56 is: 961.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.43 : 1,126.69 = 643.56 : x
  2. Step 2: Convert to fraction form
    754.43/1,126.69 = 643.56/x
  3. Step 3: Cross multiply
    754.43x = 1,126.69 × 643.56
  4. Step 4: Simplify right side
    754.43x = 725,096.74
  5. Step 5: Solve for x
    x = 725,096.74/754.43
  6. Step 6: Final answer
    x = 961.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.