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Finding the Fourth Proportional to 107.71, 161.55 and 61.91

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Solution

The fourth proportional to 107.71, 161.55 and 61.91 is: 92.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.71 : 161.55 = 61.91 : x
  2. Step 2: Convert to fraction form
    107.71/161.55 = 61.91/x
  3. Step 3: Cross multiply
    107.71x = 161.55 × 61.91
  4. Step 4: Simplify right side
    107.71x = 10,001.56
  5. Step 5: Solve for x
    x = 10,001.56/107.71
  6. Step 6: Final answer
    x = 92.86

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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.