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Finding the Fourth Proportional to 68.77, 103.17 and 57.46

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Solution

The fourth proportional to 68.77, 103.17 and 57.46 is: 86.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.77 : 103.17 = 57.46 : x
  2. Step 2: Convert to fraction form
    68.77/103.17 = 57.46/x
  3. Step 3: Cross multiply
    68.77x = 103.17 × 57.46
  4. Step 4: Simplify right side
    68.77x = 5,928.15
  5. Step 5: Solve for x
    x = 5,928.15/68.77
  6. Step 6: Final answer
    x = 86.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.