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Finding the Fourth Proportional to 788.13, 1,087.29 and 611.15

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Solution

The fourth proportional to 788.13, 1,087.29 and 611.15 is: 843.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.13 : 1,087.29 = 611.15 : x
  2. Step 2: Convert to fraction form
    788.13/1,087.29 = 611.15/x
  3. Step 3: Cross multiply
    788.13x = 1,087.29 × 611.15
  4. Step 4: Simplify right side
    788.13x = 664,491.85
  5. Step 5: Solve for x
    x = 664,491.85/788.13
  6. Step 6: Final answer
    x = 843.12

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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.