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Finding the Fourth Proportional to 68.87, 102.57 and 57.80

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Solution

The fourth proportional to 68.87, 102.57 and 57.80 is: 86.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.87 : 102.57 = 57.80 : x
  2. Step 2: Convert to fraction form
    68.87/102.57 = 57.80/x
  3. Step 3: Cross multiply
    68.87x = 102.57 × 57.80
  4. Step 4: Simplify right side
    68.87x = 5,928.25
  5. Step 5: Solve for x
    x = 5,928.25/68.87
  6. Step 6: Final answer
    x = 86.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.