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Finding the Fourth Proportional to 356.42, 491.87 and 209.04

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Solution

The fourth proportional to 356.42, 491.87 and 209.04 is: 288.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.42 : 491.87 = 209.04 : x
  2. Step 2: Convert to fraction form
    356.42/491.87 = 209.04/x
  3. Step 3: Cross multiply
    356.42x = 491.87 × 209.04
  4. Step 4: Simplify right side
    356.42x = 102,820.50
  5. Step 5: Solve for x
    x = 102,820.50/356.42
  6. Step 6: Final answer
    x = 288.48

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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.