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Finding the Fourth Proportional to 263.44, 394.89 and 100.90

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Solution

The fourth proportional to 263.44, 394.89 and 100.90 is: 151.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.44 : 394.89 = 100.90 : x
  2. Step 2: Convert to fraction form
    263.44/394.89 = 100.90/x
  3. Step 3: Cross multiply
    263.44x = 394.89 × 100.90
  4. Step 4: Simplify right side
    263.44x = 39,844.40
  5. Step 5: Solve for x
    x = 39,844.40/263.44
  6. Step 6: Final answer
    x = 151.25

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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.