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Finding the Fourth Proportional to 316.66, 436.84 and 211.72

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Solution

The fourth proportional to 316.66, 436.84 and 211.72 is: 292.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.66 : 436.84 = 211.72 : x
  2. Step 2: Convert to fraction form
    316.66/436.84 = 211.72/x
  3. Step 3: Cross multiply
    316.66x = 436.84 × 211.72
  4. Step 4: Simplify right side
    316.66x = 92,487.76
  5. Step 5: Solve for x
    x = 92,487.76/316.66
  6. Step 6: Final answer
    x = 292.07

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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.