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Finding the Fourth Proportional to 751.69, 1,121.33 and 720.58

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Solution

The fourth proportional to 751.69, 1,121.33 and 720.58 is: 1,074.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.69 : 1,121.33 = 720.58 : x
  2. Step 2: Convert to fraction form
    751.69/1,121.33 = 720.58/x
  3. Step 3: Cross multiply
    751.69x = 1,121.33 × 720.58
  4. Step 4: Simplify right side
    751.69x = 808,007.97
  5. Step 5: Solve for x
    x = 808,007.97/751.69
  6. Step 6: Final answer
    x = 1,074.92

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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.