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Finding the Fourth Proportional to 452.89, 679.10 and 209.21

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Solution

The fourth proportional to 452.89, 679.10 and 209.21 is: 313.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.89 : 679.10 = 209.21 : x
  2. Step 2: Convert to fraction form
    452.89/679.10 = 209.21/x
  3. Step 3: Cross multiply
    452.89x = 679.10 × 209.21
  4. Step 4: Simplify right side
    452.89x = 142,070.07
  5. Step 5: Solve for x
    x = 142,070.07/452.89
  6. Step 6: Final answer
    x = 313.70

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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.