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Finding the Fourth Proportional to 356.65, 492.17 and 209.28

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Solution

The fourth proportional to 356.65, 492.17 and 209.28 is: 288.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.65 : 492.17 = 209.28 : x
  2. Step 2: Convert to fraction form
    356.65/492.17 = 209.28/x
  3. Step 3: Cross multiply
    356.65x = 492.17 × 209.28
  4. Step 4: Simplify right side
    356.65x = 103,000.29
  5. Step 5: Solve for x
    x = 103,000.29/356.65
  6. Step 6: Final answer
    x = 288.80

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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.