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Finding the Fourth Proportional to 71.98, 107.81 and 65.14

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Solution

The fourth proportional to 71.98, 107.81 and 65.14 is: 97.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.98 : 107.81 = 65.14 : x
  2. Step 2: Convert to fraction form
    71.98/107.81 = 65.14/x
  3. Step 3: Cross multiply
    71.98x = 107.81 × 65.14
  4. Step 4: Simplify right side
    71.98x = 7,022.74
  5. Step 5: Solve for x
    x = 7,022.74/71.98
  6. Step 6: Final answer
    x = 97.57

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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.