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Finding the Fourth Proportional to 68.15, 102.06 and 42.39

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Solution

The fourth proportional to 68.15, 102.06 and 42.39 is: 63.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.15 : 102.06 = 42.39 : x
  2. Step 2: Convert to fraction form
    68.15/102.06 = 42.39/x
  3. Step 3: Cross multiply
    68.15x = 102.06 × 42.39
  4. Step 4: Simplify right side
    68.15x = 4,326.32
  5. Step 5: Solve for x
    x = 4,326.32/68.15
  6. Step 6: Final answer
    x = 63.48

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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.