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Finding the Fourth Proportional to 751.97, 1,128.09 and 644.51

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Solution

The fourth proportional to 751.97, 1,128.09 and 644.51 is: 966.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.97 : 1,128.09 = 644.51 : x
  2. Step 2: Convert to fraction form
    751.97/1,128.09 = 644.51/x
  3. Step 3: Cross multiply
    751.97x = 1,128.09 × 644.51
  4. Step 4: Simplify right side
    751.97x = 727,065.29
  5. Step 5: Solve for x
    x = 727,065.29/751.97
  6. Step 6: Final answer
    x = 966.88

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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.