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Finding the Fourth Proportional to 356.61, 492.13 and 209.22

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Solution

The fourth proportional to 356.61, 492.13 and 209.22 is: 288.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.61 : 492.13 = 209.22 : x
  2. Step 2: Convert to fraction form
    356.61/492.13 = 209.22/x
  3. Step 3: Cross multiply
    356.61x = 492.13 × 209.22
  4. Step 4: Simplify right side
    356.61x = 102,963.44
  5. Step 5: Solve for x
    x = 102,963.44/356.61
  6. Step 6: Final answer
    x = 288.73

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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.