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Finding the Fourth Proportional to 751.11, 1,120.86 and 669.30

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Solution

The fourth proportional to 751.11, 1,120.86 and 669.30 is: 998.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.11 : 1,120.86 = 669.30 : x
  2. Step 2: Convert to fraction form
    751.11/1,120.86 = 669.30/x
  3. Step 3: Cross multiply
    751.11x = 1,120.86 × 669.30
  4. Step 4: Simplify right side
    751.11x = 750,191.60
  5. Step 5: Solve for x
    x = 750,191.60/751.11
  6. Step 6: Final answer
    x = 998.78

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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.