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Finding the Fourth Proportional to 315.44, 435.37 and 191.21

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Solution

The fourth proportional to 315.44, 435.37 and 191.21 is: 263.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.44 : 435.37 = 191.21 : x
  2. Step 2: Convert to fraction form
    315.44/435.37 = 191.21/x
  3. Step 3: Cross multiply
    315.44x = 435.37 × 191.21
  4. Step 4: Simplify right side
    315.44x = 83,245.05
  5. Step 5: Solve for x
    x = 83,245.05/315.44
  6. Step 6: Final answer
    x = 263.90

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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.