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Finding the Fourth Proportional to 70.31, 104.93 and 68.48

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Solution

The fourth proportional to 70.31, 104.93 and 68.48 is: 102.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.31 : 104.93 = 68.48 : x
  2. Step 2: Convert to fraction form
    70.31/104.93 = 68.48/x
  3. Step 3: Cross multiply
    70.31x = 104.93 × 68.48
  4. Step 4: Simplify right side
    70.31x = 7,186.11
  5. Step 5: Solve for x
    x = 7,186.11/70.31
  6. Step 6: Final answer
    x = 102.21

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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.