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Finding the Fourth Proportional to 778.25, 1,074.15 and 699.42

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Solution

The fourth proportional to 778.25, 1,074.15 and 699.42 is: 965.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.25 : 1,074.15 = 699.42 : x
  2. Step 2: Convert to fraction form
    778.25/1,074.15 = 699.42/x
  3. Step 3: Cross multiply
    778.25x = 1,074.15 × 699.42
  4. Step 4: Simplify right side
    778.25x = 751,281.99
  5. Step 5: Solve for x
    x = 751,281.99/778.25
  6. Step 6: Final answer
    x = 965.35

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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.