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Finding the Fourth Proportional to 482.20, 665.02 and 388.92

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Solution

The fourth proportional to 482.20, 665.02 and 388.92 is: 536.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.20 : 665.02 = 388.92 : x
  2. Step 2: Convert to fraction form
    482.20/665.02 = 388.92/x
  3. Step 3: Cross multiply
    482.20x = 665.02 × 388.92
  4. Step 4: Simplify right side
    482.20x = 258,639.58
  5. Step 5: Solve for x
    x = 258,639.58/482.20
  6. Step 6: Final answer
    x = 536.37

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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.