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Finding the Fourth Proportional to 72.46, 107.87 and 68.95

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Solution

The fourth proportional to 72.46, 107.87 and 68.95 is: 102.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.46 : 107.87 = 68.95 : x
  2. Step 2: Convert to fraction form
    72.46/107.87 = 68.95/x
  3. Step 3: Cross multiply
    72.46x = 107.87 × 68.95
  4. Step 4: Simplify right side
    72.46x = 7,437.64
  5. Step 5: Solve for x
    x = 7,437.64/72.46
  6. Step 6: Final answer
    x = 102.64

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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.