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Finding the Fourth Proportional to 751.80, 1,040.94 and 694.20

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Solution

The fourth proportional to 751.80, 1,040.94 and 694.20 is: 961.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.80 : 1,040.94 = 694.20 : x
  2. Step 2: Convert to fraction form
    751.80/1,040.94 = 694.20/x
  3. Step 3: Cross multiply
    751.80x = 1,040.94 × 694.20
  4. Step 4: Simplify right side
    751.80x = 722,620.55
  5. Step 5: Solve for x
    x = 722,620.55/751.80
  6. Step 6: Final answer
    x = 961.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.