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Finding the Fourth Proportional to 687.59, 949.02 and 438.85

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Solution

The fourth proportional to 687.59, 949.02 and 438.85 is: 605.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.59 : 949.02 = 438.85 : x
  2. Step 2: Convert to fraction form
    687.59/949.02 = 438.85/x
  3. Step 3: Cross multiply
    687.59x = 949.02 × 438.85
  4. Step 4: Simplify right side
    687.59x = 416,476.97
  5. Step 5: Solve for x
    x = 416,476.97/687.59
  6. Step 6: Final answer
    x = 605.71

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.