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Finding the Fourth Proportional to 68.31, 94.23 and 50.90

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Solution

The fourth proportional to 68.31, 94.23 and 50.90 is: 70.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.31 : 94.23 = 50.90 : x
  2. Step 2: Convert to fraction form
    68.31/94.23 = 50.90/x
  3. Step 3: Cross multiply
    68.31x = 94.23 × 50.90
  4. Step 4: Simplify right side
    68.31x = 4,795.84
  5. Step 5: Solve for x
    x = 4,795.84/68.31
  6. Step 6: Final answer
    x = 70.21

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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.