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Finding the Fourth Proportional to 754.96, 1,126 and 640.16

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Solution

The fourth proportional to 754.96, 1,126 and 640.16 is: 954.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.96 : 1,126 = 640.16 : x
  2. Step 2: Convert to fraction form
    754.96/1,126 = 640.16/x
  3. Step 3: Cross multiply
    754.96x = 1,126 × 640.16
  4. Step 4: Simplify right side
    754.96x = 720,820.16
  5. Step 5: Solve for x
    x = 720,820.16/754.96
  6. Step 6: Final answer
    x = 954.78

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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.