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Finding the Fourth Proportional to 68.73, 103.20 and 64.50

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Solution

The fourth proportional to 68.73, 103.20 and 64.50 is: 96.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.73 : 103.20 = 64.50 : x
  2. Step 2: Convert to fraction form
    68.73/103.20 = 64.50/x
  3. Step 3: Cross multiply
    68.73x = 103.20 × 64.50
  4. Step 4: Simplify right side
    68.73x = 6,656.40
  5. Step 5: Solve for x
    x = 6,656.40/68.73
  6. Step 6: Final answer
    x = 96.85

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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.