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Finding the Fourth Proportional to 95.70, 131.28 and 87.60

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Solution

The fourth proportional to 95.70, 131.28 and 87.60 is: 120.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.70 : 131.28 = 87.60 : x
  2. Step 2: Convert to fraction form
    95.70/131.28 = 87.60/x
  3. Step 3: Cross multiply
    95.70x = 131.28 × 87.60
  4. Step 4: Simplify right side
    95.70x = 11,500.13
  5. Step 5: Solve for x
    x = 11,500.13/95.70
  6. Step 6: Final answer
    x = 120.17

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.