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Finding the Fourth Proportional to 206.86, 285.36 and 151.54

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Solution

The fourth proportional to 206.86, 285.36 and 151.54 is: 209.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.86 : 285.36 = 151.54 : x
  2. Step 2: Convert to fraction form
    206.86/285.36 = 151.54/x
  3. Step 3: Cross multiply
    206.86x = 285.36 × 151.54
  4. Step 4: Simplify right side
    206.86x = 43,243.45
  5. Step 5: Solve for x
    x = 43,243.45/206.86
  6. Step 6: Final answer
    x = 209.05

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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.