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Finding the Fourth Proportional to 71.91, 107.81 and 35.36

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Solution

The fourth proportional to 71.91, 107.81 and 35.36 is: 53.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.91 : 107.81 = 35.36 : x
  2. Step 2: Convert to fraction form
    71.91/107.81 = 35.36/x
  3. Step 3: Cross multiply
    71.91x = 107.81 × 35.36
  4. Step 4: Simplify right side
    71.91x = 3,812.16
  5. Step 5: Solve for x
    x = 3,812.16/71.91
  6. Step 6: Final answer
    x = 53.01

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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.