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Finding the Fourth Proportional to 68.93, 95.15 and 42.70

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Solution

The fourth proportional to 68.93, 95.15 and 42.70 is: 58.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.93 : 95.15 = 42.70 : x
  2. Step 2: Convert to fraction form
    68.93/95.15 = 42.70/x
  3. Step 3: Cross multiply
    68.93x = 95.15 × 42.70
  4. Step 4: Simplify right side
    68.93x = 4,063.05
  5. Step 5: Solve for x
    x = 4,063.05/68.93
  6. Step 6: Final answer
    x = 58.95

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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.