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Finding the Fourth Proportional to 490.71, 677.51 and 386.22

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Solution

The fourth proportional to 490.71, 677.51 and 386.22 is: 533.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.71 : 677.51 = 386.22 : x
  2. Step 2: Convert to fraction form
    490.71/677.51 = 386.22/x
  3. Step 3: Cross multiply
    490.71x = 677.51 × 386.22
  4. Step 4: Simplify right side
    490.71x = 261,665.98
  5. Step 5: Solve for x
    x = 261,665.98/490.71
  6. Step 6: Final answer
    x = 533.24

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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.