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Finding the Fourth Proportional to 452.90, 679.70 and 209.60

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Solution

The fourth proportional to 452.90, 679.70 and 209.60 is: 314.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.90 : 679.70 = 209.60 : x
  2. Step 2: Convert to fraction form
    452.90/679.70 = 209.60/x
  3. Step 3: Cross multiply
    452.90x = 679.70 × 209.60
  4. Step 4: Simplify right side
    452.90x = 142,465.12
  5. Step 5: Solve for x
    x = 142,465.12/452.90
  6. Step 6: Final answer
    x = 314.56

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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.