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Finding the Fourth Proportional to 788.22, 1,087.68 and 438.90

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Solution

The fourth proportional to 788.22, 1,087.68 and 438.90 is: 605.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.22 : 1,087.68 = 438.90 : x
  2. Step 2: Convert to fraction form
    788.22/1,087.68 = 438.90/x
  3. Step 3: Cross multiply
    788.22x = 1,087.68 × 438.90
  4. Step 4: Simplify right side
    788.22x = 477,382.75
  5. Step 5: Solve for x
    x = 477,382.75/788.22
  6. Step 6: Final answer
    x = 605.65

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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.