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Finding the Fourth Proportional to 68.31, 101.70 and 67.35

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Solution

The fourth proportional to 68.31, 101.70 and 67.35 is: 100.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.31 : 101.70 = 67.35 : x
  2. Step 2: Convert to fraction form
    68.31/101.70 = 67.35/x
  3. Step 3: Cross multiply
    68.31x = 101.70 × 67.35
  4. Step 4: Simplify right side
    68.31x = 6,849.50
  5. Step 5: Solve for x
    x = 6,849.50/68.31
  6. Step 6: Final answer
    x = 100.27

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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.