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Finding the Fourth Proportional to 68.77, 103.09 and 61.18

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Solution

The fourth proportional to 68.77, 103.09 and 61.18 is: 91.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.77 : 103.09 = 61.18 : x
  2. Step 2: Convert to fraction form
    68.77/103.09 = 61.18/x
  3. Step 3: Cross multiply
    68.77x = 103.09 × 61.18
  4. Step 4: Simplify right side
    68.77x = 6,307.05
  5. Step 5: Solve for x
    x = 6,307.05/68.77
  6. Step 6: Final answer
    x = 91.71

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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.