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Finding the Fourth Proportional to 205.99, 284.14 and 153.55

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Solution

The fourth proportional to 205.99, 284.14 and 153.55 is: 211.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.99 : 284.14 = 153.55 : x
  2. Step 2: Convert to fraction form
    205.99/284.14 = 153.55/x
  3. Step 3: Cross multiply
    205.99x = 284.14 × 153.55
  4. Step 4: Simplify right side
    205.99x = 43,631.04
  5. Step 5: Solve for x
    x = 43,631.04/205.99
  6. Step 6: Final answer
    x = 211.81

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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.