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Finding the Fourth Proportional to 95.80, 144.28 and 90.40

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Solution

The fourth proportional to 95.80, 144.28 and 90.40 is: 136.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.80 : 144.28 = 90.40 : x
  2. Step 2: Convert to fraction form
    95.80/144.28 = 90.40/x
  3. Step 3: Cross multiply
    95.80x = 144.28 × 90.40
  4. Step 4: Simplify right side
    95.80x = 13,042.91
  5. Step 5: Solve for x
    x = 13,042.91/95.80
  6. Step 6: Final answer
    x = 136.15

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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.