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Finding the Fourth Proportional to 105.60, 158.09 and 86.36

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Solution

The fourth proportional to 105.60, 158.09 and 86.36 is: 129.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.60 : 158.09 = 86.36 : x
  2. Step 2: Convert to fraction form
    105.60/158.09 = 86.36/x
  3. Step 3: Cross multiply
    105.60x = 158.09 × 86.36
  4. Step 4: Simplify right side
    105.60x = 13,652.65
  5. Step 5: Solve for x
    x = 13,652.65/105.60
  6. Step 6: Final answer
    x = 129.29

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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.