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Finding the Fourth Proportional to 95.78, 144.37 and 90.20

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Solution

The fourth proportional to 95.78, 144.37 and 90.20 is: 135.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.78 : 144.37 = 90.20 : x
  2. Step 2: Convert to fraction form
    95.78/144.37 = 90.20/x
  3. Step 3: Cross multiply
    95.78x = 144.37 × 90.20
  4. Step 4: Simplify right side
    95.78x = 13,022.76
  5. Step 5: Solve for x
    x = 13,022.76/95.78
  6. Step 6: Final answer
    x = 135.97

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.