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Finding the Fourth Proportional to 356.55, 491.89 and 209.12

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Solution

The fourth proportional to 356.55, 491.89 and 209.12 is: 288.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.55 : 491.89 = 209.12 : x
  2. Step 2: Convert to fraction form
    356.55/491.89 = 209.12/x
  3. Step 3: Cross multiply
    356.55x = 491.89 × 209.12
  4. Step 4: Simplify right side
    356.55x = 102,862.64
  5. Step 5: Solve for x
    x = 102,862.64/356.55
  6. Step 6: Final answer
    x = 288.49

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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.