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Finding the Fourth Proportional to 357.98, 493.38 and 287.91

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Solution

The fourth proportional to 357.98, 493.38 and 287.91 is: 396.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.98 : 493.38 = 287.91 : x
  2. Step 2: Convert to fraction form
    357.98/493.38 = 287.91/x
  3. Step 3: Cross multiply
    357.98x = 493.38 × 287.91
  4. Step 4: Simplify right side
    357.98x = 142,049.04
  5. Step 5: Solve for x
    x = 142,049.04/357.98
  6. Step 6: Final answer
    x = 396.81

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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.