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Finding the Fourth Proportional to 329.99, 455.15 and 211.76

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Solution

The fourth proportional to 329.99, 455.15 and 211.76 is: 292.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.99 : 455.15 = 211.76 : x
  2. Step 2: Convert to fraction form
    329.99/455.15 = 211.76/x
  3. Step 3: Cross multiply
    329.99x = 455.15 × 211.76
  4. Step 4: Simplify right side
    329.99x = 96,382.56
  5. Step 5: Solve for x
    x = 96,382.56/329.99
  6. Step 6: Final answer
    x = 292.08

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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.