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Finding the Fourth Proportional to 105.80, 158.64 and 71.60

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Solution

The fourth proportional to 105.80, 158.64 and 71.60 is: 107.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.80 : 158.64 = 71.60 : x
  2. Step 2: Convert to fraction form
    105.80/158.64 = 71.60/x
  3. Step 3: Cross multiply
    105.80x = 158.64 × 71.60
  4. Step 4: Simplify right side
    105.80x = 11,358.62
  5. Step 5: Solve for x
    x = 11,358.62/105.80
  6. Step 6: Final answer
    x = 107.36

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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.