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Finding the Fourth Proportional to 751.23, 1,121.15 and 731.79

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Solution

The fourth proportional to 751.23, 1,121.15 and 731.79 is: 1,092.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.23 : 1,121.15 = 731.79 : x
  2. Step 2: Convert to fraction form
    751.23/1,121.15 = 731.79/x
  3. Step 3: Cross multiply
    751.23x = 1,121.15 × 731.79
  4. Step 4: Simplify right side
    751.23x = 820,448.19
  5. Step 5: Solve for x
    x = 820,448.19/751.23
  6. Step 6: Final answer
    x = 1,092.14

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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.