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Finding the Fourth Proportional to 788.14, 1,087.68 and 438.88

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Solution

The fourth proportional to 788.14, 1,087.68 and 438.88 is: 605.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.14 : 1,087.68 = 438.88 : x
  2. Step 2: Convert to fraction form
    788.14/1,087.68 = 438.88/x
  3. Step 3: Cross multiply
    788.14x = 1,087.68 × 438.88
  4. Step 4: Simplify right side
    788.14x = 477,361.00
  5. Step 5: Solve for x
    x = 477,361.00/788.14
  6. Step 6: Final answer
    x = 605.68

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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.