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Finding the Fourth Proportional to 490.90, 677.40 and 269.81

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Solution

The fourth proportional to 490.90, 677.40 and 269.81 is: 372.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.90 : 677.40 = 269.81 : x
  2. Step 2: Convert to fraction form
    490.90/677.40 = 269.81/x
  3. Step 3: Cross multiply
    490.90x = 677.40 × 269.81
  4. Step 4: Simplify right side
    490.90x = 182,769.29
  5. Step 5: Solve for x
    x = 182,769.29/490.90
  6. Step 6: Final answer
    x = 372.31

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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.