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Finding the Fourth Proportional to 316.25, 436.35 and 191.90

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Solution

The fourth proportional to 316.25, 436.35 and 191.90 is: 264.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.25 : 436.35 = 191.90 : x
  2. Step 2: Convert to fraction form
    316.25/436.35 = 191.90/x
  3. Step 3: Cross multiply
    316.25x = 436.35 × 191.90
  4. Step 4: Simplify right side
    316.25x = 83,736.66
  5. Step 5: Solve for x
    x = 83,736.66/316.25
  6. Step 6: Final answer
    x = 264.78

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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.