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Finding the Fourth Proportional to 482.31, 664.83 and 388.62

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Solution

The fourth proportional to 482.31, 664.83 and 388.62 is: 535.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.31 : 664.83 = 388.62 : x
  2. Step 2: Convert to fraction form
    482.31/664.83 = 388.62/x
  3. Step 3: Cross multiply
    482.31x = 664.83 × 388.62
  4. Step 4: Simplify right side
    482.31x = 258,366.23
  5. Step 5: Solve for x
    x = 258,366.23/482.31
  6. Step 6: Final answer
    x = 535.69

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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.