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Finding the Fourth Proportional to 456.39, 685.28 and 274.59

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Solution

The fourth proportional to 456.39, 685.28 and 274.59 is: 412.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.39 : 685.28 = 274.59 : x
  2. Step 2: Convert to fraction form
    456.39/685.28 = 274.59/x
  3. Step 3: Cross multiply
    456.39x = 685.28 × 274.59
  4. Step 4: Simplify right side
    456.39x = 188,171.72
  5. Step 5: Solve for x
    x = 188,171.72/456.39
  6. Step 6: Final answer
    x = 412.30

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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.