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Finding the Fourth Proportional to 316.18, 436.41 and 281.62

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Solution

The fourth proportional to 316.18, 436.41 and 281.62 is: 388.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.18 : 436.41 = 281.62 : x
  2. Step 2: Convert to fraction form
    316.18/436.41 = 281.62/x
  3. Step 3: Cross multiply
    316.18x = 436.41 × 281.62
  4. Step 4: Simplify right side
    316.18x = 122,901.78
  5. Step 5: Solve for x
    x = 122,901.78/316.18
  6. Step 6: Final answer
    x = 388.71

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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.