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Finding the Fourth Proportional to 687.58, 948.98 and 438.98

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Solution

The fourth proportional to 687.58, 948.98 and 438.98 is: 605.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.58 : 948.98 = 438.98 : x
  2. Step 2: Convert to fraction form
    687.58/948.98 = 438.98/x
  3. Step 3: Cross multiply
    687.58x = 948.98 × 438.98
  4. Step 4: Simplify right side
    687.58x = 416,579.59
  5. Step 5: Solve for x
    x = 416,579.59/687.58
  6. Step 6: Final answer
    x = 605.87

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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.