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Finding the Fourth Proportional to 456.79, 685.38 and 274.54

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Solution

The fourth proportional to 456.79, 685.38 and 274.54 is: 411.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.79 : 685.38 = 274.54 : x
  2. Step 2: Convert to fraction form
    456.79/685.38 = 274.54/x
  3. Step 3: Cross multiply
    456.79x = 685.38 × 274.54
  4. Step 4: Simplify right side
    456.79x = 188,164.23
  5. Step 5: Solve for x
    x = 188,164.23/456.79
  6. Step 6: Final answer
    x = 411.93

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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.