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Finding the Fourth Proportional to 107.58, 161.45 and 86.46

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Solution

The fourth proportional to 107.58, 161.45 and 86.46 is: 129.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.58 : 161.45 = 86.46 : x
  2. Step 2: Convert to fraction form
    107.58/161.45 = 86.46/x
  3. Step 3: Cross multiply
    107.58x = 161.45 × 86.46
  4. Step 4: Simplify right side
    107.58x = 13,958.97
  5. Step 5: Solve for x
    x = 13,958.97/107.58
  6. Step 6: Final answer
    x = 129.75

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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.