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Finding the Fourth Proportional to 206.13, 284.30 and 153.85

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Solution

The fourth proportional to 206.13, 284.30 and 153.85 is: 212.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.13 : 284.30 = 153.85 : x
  2. Step 2: Convert to fraction form
    206.13/284.30 = 153.85/x
  3. Step 3: Cross multiply
    206.13x = 284.30 × 153.85
  4. Step 4: Simplify right side
    206.13x = 43,739.56
  5. Step 5: Solve for x
    x = 43,739.56/206.13
  6. Step 6: Final answer
    x = 212.19

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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.