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Finding the Fourth Proportional to 751.11, 1,121.24 and 649.05

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Solution

The fourth proportional to 751.11, 1,121.24 and 649.05 is: 968.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.11 : 1,121.24 = 649.05 : x
  2. Step 2: Convert to fraction form
    751.11/1,121.24 = 649.05/x
  3. Step 3: Cross multiply
    751.11x = 1,121.24 × 649.05
  4. Step 4: Simplify right side
    751.11x = 727,737.58
  5. Step 5: Solve for x
    x = 727,737.58/751.11
  6. Step 6: Final answer
    x = 968.88

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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.