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Finding the Fourth Proportional to 68.55, 102.23 and 66.79

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Solution

The fourth proportional to 68.55, 102.23 and 66.79 is: 99.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.55 : 102.23 = 66.79 : x
  2. Step 2: Convert to fraction form
    68.55/102.23 = 66.79/x
  3. Step 3: Cross multiply
    68.55x = 102.23 × 66.79
  4. Step 4: Simplify right side
    68.55x = 6,827.99
  5. Step 5: Solve for x
    x = 6,827.99/68.55
  6. Step 6: Final answer
    x = 99.61

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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.