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Finding the Fourth Proportional to 456.86, 685.23 and 127.82

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Solution

The fourth proportional to 456.86, 685.23 and 127.82 is: 191.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.86 : 685.23 = 127.82 : x
  2. Step 2: Convert to fraction form
    456.86/685.23 = 127.82/x
  3. Step 3: Cross multiply
    456.86x = 685.23 × 127.82
  4. Step 4: Simplify right side
    456.86x = 87,586.10
  5. Step 5: Solve for x
    x = 87,586.10/456.86
  6. Step 6: Final answer
    x = 191.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.