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Finding the Fourth Proportional to 452.54, 678.99 and 209.21

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Solution

The fourth proportional to 452.54, 678.99 and 209.21 is: 313.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.54 : 678.99 = 209.21 : x
  2. Step 2: Convert to fraction form
    452.54/678.99 = 209.21/x
  3. Step 3: Cross multiply
    452.54x = 678.99 × 209.21
  4. Step 4: Simplify right side
    452.54x = 142,051.50
  5. Step 5: Solve for x
    x = 142,051.50/452.54
  6. Step 6: Final answer
    x = 313.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.