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Finding the Fourth Proportional to 484.19, 668.21 and 307.09

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Solution

The fourth proportional to 484.19, 668.21 and 307.09 is: 423.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.19 : 668.21 = 307.09 : x
  2. Step 2: Convert to fraction form
    484.19/668.21 = 307.09/x
  3. Step 3: Cross multiply
    484.19x = 668.21 × 307.09
  4. Step 4: Simplify right side
    484.19x = 205,195.73
  5. Step 5: Solve for x
    x = 205,195.73/484.19
  6. Step 6: Final answer
    x = 423.79

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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.