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Finding the Fourth Proportional to 788.91, 1,087.34 and 578.79

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Solution

The fourth proportional to 788.91, 1,087.34 and 578.79 is: 797.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.91 : 1,087.34 = 578.79 : x
  2. Step 2: Convert to fraction form
    788.91/1,087.34 = 578.79/x
  3. Step 3: Cross multiply
    788.91x = 1,087.34 × 578.79
  4. Step 4: Simplify right side
    788.91x = 629,338.62
  5. Step 5: Solve for x
    x = 629,338.62/788.91
  6. Step 6: Final answer
    x = 797.73

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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.