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Finding the Fourth Proportional to 356.75, 492.20 and 209.28

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Solution

The fourth proportional to 356.75, 492.20 and 209.28 is: 288.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.75 : 492.20 = 209.28 : x
  2. Step 2: Convert to fraction form
    356.75/492.20 = 209.28/x
  3. Step 3: Cross multiply
    356.75x = 492.20 × 209.28
  4. Step 4: Simplify right side
    356.75x = 103,007.62
  5. Step 5: Solve for x
    x = 103,007.62/356.75
  6. Step 6: Final answer
    x = 288.74

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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.