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Finding the Fourth Proportional to 206.85, 285.43 and 151.62

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Solution

The fourth proportional to 206.85, 285.43 and 151.62 is: 209.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.85 : 285.43 = 151.62 : x
  2. Step 2: Convert to fraction form
    206.85/285.43 = 151.62/x
  3. Step 3: Cross multiply
    206.85x = 285.43 × 151.62
  4. Step 4: Simplify right side
    206.85x = 43,275.47
  5. Step 5: Solve for x
    x = 43,275.47/206.85
  6. Step 6: Final answer
    x = 209.21

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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.