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Finding the Fourth Proportional to 484.64, 668.64 and 309.96

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Solution

The fourth proportional to 484.64, 668.64 and 309.96 is: 427.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.64 : 668.64 = 309.96 : x
  2. Step 2: Convert to fraction form
    484.64/668.64 = 309.96/x
  3. Step 3: Cross multiply
    484.64x = 668.64 × 309.96
  4. Step 4: Simplify right side
    484.64x = 207,251.65
  5. Step 5: Solve for x
    x = 207,251.65/484.64
  6. Step 6: Final answer
    x = 427.64

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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.