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Finding the Fourth Proportional to 754.74, 1,128.41 and 640.46

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Solution

The fourth proportional to 754.74, 1,128.41 and 640.46 is: 957.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.74 : 1,128.41 = 640.46 : x
  2. Step 2: Convert to fraction form
    754.74/1,128.41 = 640.46/x
  3. Step 3: Cross multiply
    754.74x = 1,128.41 × 640.46
  4. Step 4: Simplify right side
    754.74x = 722,703.49
  5. Step 5: Solve for x
    x = 722,703.49/754.74
  6. Step 6: Final answer
    x = 957.55

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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.