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Finding the Fourth Proportional to 68.79, 102.62 and 66.93

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Solution

The fourth proportional to 68.79, 102.62 and 66.93 is: 99.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.79 : 102.62 = 66.93 : x
  2. Step 2: Convert to fraction form
    68.79/102.62 = 66.93/x
  3. Step 3: Cross multiply
    68.79x = 102.62 × 66.93
  4. Step 4: Simplify right side
    68.79x = 6,868.36
  5. Step 5: Solve for x
    x = 6,868.36/68.79
  6. Step 6: Final answer
    x = 99.85

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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.