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Finding the Fourth Proportional to 456.72, 685.05 and 127.65

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Solution

The fourth proportional to 456.72, 685.05 and 127.65 is: 191.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.72 : 685.05 = 127.65 : x
  2. Step 2: Convert to fraction form
    456.72/685.05 = 127.65/x
  3. Step 3: Cross multiply
    456.72x = 685.05 × 127.65
  4. Step 4: Simplify right side
    456.72x = 87,446.63
  5. Step 5: Solve for x
    x = 87,446.63/456.72
  6. Step 6: Final answer
    x = 191.47

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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.