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Finding the Fourth Proportional to 357, 492.78 and 226.20

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Solution

The fourth proportional to 357, 492.78 and 226.20 is: 312.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    357 : 492.78 = 226.20 : x
  2. Step 2: Convert to fraction form
    357/492.78 = 226.20/x
  3. Step 3: Cross multiply
    357x = 492.78 × 226.20
  4. Step 4: Simplify right side
    357x = 111,466.84
  5. Step 5: Solve for x
    x = 111,466.84/357
  6. Step 6: Final answer
    x = 312.23

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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.