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Finding the Fourth Proportional to 754.16, 1,128.54 and 664.16

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Solution

The fourth proportional to 754.16, 1,128.54 and 664.16 is: 993.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.16 : 1,128.54 = 664.16 : x
  2. Step 2: Convert to fraction form
    754.16/1,128.54 = 664.16/x
  3. Step 3: Cross multiply
    754.16x = 1,128.54 × 664.16
  4. Step 4: Simplify right side
    754.16x = 749,531.13
  5. Step 5: Solve for x
    x = 749,531.13/754.16
  6. Step 6: Final answer
    x = 993.86

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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.