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Finding the Fourth Proportional to 751.74, 1,128.41 and 665.61

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Solution

The fourth proportional to 751.74, 1,128.41 and 665.61 is: 999.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.74 : 1,128.41 = 665.61 : x
  2. Step 2: Convert to fraction form
    751.74/1,128.41 = 665.61/x
  3. Step 3: Cross multiply
    751.74x = 1,128.41 × 665.61
  4. Step 4: Simplify right side
    751.74x = 751,077.65
  5. Step 5: Solve for x
    x = 751,077.65/751.74
  6. Step 6: Final answer
    x = 999.12

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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.