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Finding the Fourth Proportional to 68.14, 94.26 and 65.71

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Solution

The fourth proportional to 68.14, 94.26 and 65.71 is: 90.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.14 : 94.26 = 65.71 : x
  2. Step 2: Convert to fraction form
    68.14/94.26 = 65.71/x
  3. Step 3: Cross multiply
    68.14x = 94.26 × 65.71
  4. Step 4: Simplify right side
    68.14x = 6,193.82
  5. Step 5: Solve for x
    x = 6,193.82/68.14
  6. Step 6: Final answer
    x = 90.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.