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Finding the Fourth Proportional to 788.12, 1,085.20 and 622.27

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Solution

The fourth proportional to 788.12, 1,085.20 and 622.27 is: 856.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.12 : 1,085.20 = 622.27 : x
  2. Step 2: Convert to fraction form
    788.12/1,085.20 = 622.27/x
  3. Step 3: Cross multiply
    788.12x = 1,085.20 × 622.27
  4. Step 4: Simplify right side
    788.12x = 675,287.40
  5. Step 5: Solve for x
    x = 675,287.40/788.12
  6. Step 6: Final answer
    x = 856.83

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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.