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Finding the Fourth Proportional to 356.20, 494.91 and 351.74

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Solution

The fourth proportional to 356.20, 494.91 and 351.74 is: 488.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.20 : 494.91 = 351.74 : x
  2. Step 2: Convert to fraction form
    356.20/494.91 = 351.74/x
  3. Step 3: Cross multiply
    356.20x = 494.91 × 351.74
  4. Step 4: Simplify right side
    356.20x = 174,080.88
  5. Step 5: Solve for x
    x = 174,080.88/356.20
  6. Step 6: Final answer
    x = 488.72

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.