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Finding the Fourth Proportional to 751.42, 1,122.20 and 674.88

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Solution

The fourth proportional to 751.42, 1,122.20 and 674.88 is: 1,007.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.42 : 1,122.20 = 674.88 : x
  2. Step 2: Convert to fraction form
    751.42/1,122.20 = 674.88/x
  3. Step 3: Cross multiply
    751.42x = 1,122.20 × 674.88
  4. Step 4: Simplify right side
    751.42x = 757,350.34
  5. Step 5: Solve for x
    x = 757,350.34/751.42
  6. Step 6: Final answer
    x = 1,007.89

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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.