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Finding the Fourth Proportional to 788.18, 1,087.70 and 438.87

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Solution

The fourth proportional to 788.18, 1,087.70 and 438.87 is: 605.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.18 : 1,087.70 = 438.87 : x
  2. Step 2: Convert to fraction form
    788.18/1,087.70 = 438.87/x
  3. Step 3: Cross multiply
    788.18x = 1,087.70 × 438.87
  4. Step 4: Simplify right side
    788.18x = 477,356.70
  5. Step 5: Solve for x
    x = 477,356.70/788.18
  6. Step 6: Final answer
    x = 605.64

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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.