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Finding the Fourth Proportional to 68.36, 102.43 and 66.51

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Solution

The fourth proportional to 68.36, 102.43 and 66.51 is: 99.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.36 : 102.43 = 66.51 : x
  2. Step 2: Convert to fraction form
    68.36/102.43 = 66.51/x
  3. Step 3: Cross multiply
    68.36x = 102.43 × 66.51
  4. Step 4: Simplify right side
    68.36x = 6,812.62
  5. Step 5: Solve for x
    x = 6,812.62/68.36
  6. Step 6: Final answer
    x = 99.66

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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.