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Finding the Fourth Proportional to 356.81, 492.46 and 209.54

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Solution

The fourth proportional to 356.81, 492.46 and 209.54 is: 289.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.81 : 492.46 = 209.54 : x
  2. Step 2: Convert to fraction form
    356.81/492.46 = 209.54/x
  3. Step 3: Cross multiply
    356.81x = 492.46 × 209.54
  4. Step 4: Simplify right side
    356.81x = 103,190.78
  5. Step 5: Solve for x
    x = 103,190.78/356.81
  6. Step 6: Final answer
    x = 289.21

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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.