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Finding the Fourth Proportional to 495.79, 684.21 and 274.79

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Solution

The fourth proportional to 495.79, 684.21 and 274.79 is: 379.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.79 : 684.21 = 274.79 : x
  2. Step 2: Convert to fraction form
    495.79/684.21 = 274.79/x
  3. Step 3: Cross multiply
    495.79x = 684.21 × 274.79
  4. Step 4: Simplify right side
    495.79x = 188,016.81
  5. Step 5: Solve for x
    x = 188,016.81/495.79
  6. Step 6: Final answer
    x = 379.23

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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.