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Finding the Fourth Proportional to 356.64, 492.27 and 209.31

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Solution

The fourth proportional to 356.64, 492.27 and 209.31 is: 288.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.64 : 492.27 = 209.31 : x
  2. Step 2: Convert to fraction form
    356.64/492.27 = 209.31/x
  3. Step 3: Cross multiply
    356.64x = 492.27 × 209.31
  4. Step 4: Simplify right side
    356.64x = 103,033.53
  5. Step 5: Solve for x
    x = 103,033.53/356.64
  6. Step 6: Final answer
    x = 288.90

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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.