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Finding the Fourth Proportional to 68.94, 103.21 and 66.65

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Solution

The fourth proportional to 68.94, 103.21 and 66.65 is: 99.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.94 : 103.21 = 66.65 : x
  2. Step 2: Convert to fraction form
    68.94/103.21 = 66.65/x
  3. Step 3: Cross multiply
    68.94x = 103.21 × 66.65
  4. Step 4: Simplify right side
    68.94x = 6,878.26
  5. Step 5: Solve for x
    x = 6,878.26/68.94
  6. Step 6: Final answer
    x = 99.77

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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.