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Finding the Fourth Proportional to 95.64, 131.94 and 85.20

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Solution

The fourth proportional to 95.64, 131.94 and 85.20 is: 117.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.64 : 131.94 = 85.20 : x
  2. Step 2: Convert to fraction form
    95.64/131.94 = 85.20/x
  3. Step 3: Cross multiply
    95.64x = 131.94 × 85.20
  4. Step 4: Simplify right side
    95.64x = 11,241.29
  5. Step 5: Solve for x
    x = 11,241.29/95.64
  6. Step 6: Final answer
    x = 117.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.