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Finding the Fourth Proportional to 316.98, 436.25 and 281.88

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Solution

The fourth proportional to 316.98, 436.25 and 281.88 is: 387.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.98 : 436.25 = 281.88 : x
  2. Step 2: Convert to fraction form
    316.98/436.25 = 281.88/x
  3. Step 3: Cross multiply
    316.98x = 436.25 × 281.88
  4. Step 4: Simplify right side
    316.98x = 122,970.85
  5. Step 5: Solve for x
    x = 122,970.85/316.98
  6. Step 6: Final answer
    x = 387.95

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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.