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Finding the Fourth Proportional to 105.54, 158.72 and 85.29

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Solution

The fourth proportional to 105.54, 158.72 and 85.29 is: 128.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.54 : 158.72 = 85.29 : x
  2. Step 2: Convert to fraction form
    105.54/158.72 = 85.29/x
  3. Step 3: Cross multiply
    105.54x = 158.72 × 85.29
  4. Step 4: Simplify right side
    105.54x = 13,536.80
  5. Step 5: Solve for x
    x = 13,536.80/105.54
  6. Step 6: Final answer
    x = 128.26

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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.