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Finding the Fourth Proportional to 482.09, 665.28 and 285.57

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Solution

The fourth proportional to 482.09, 665.28 and 285.57 is: 394.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.09 : 665.28 = 285.57 : x
  2. Step 2: Convert to fraction form
    482.09/665.28 = 285.57/x
  3. Step 3: Cross multiply
    482.09x = 665.28 × 285.57
  4. Step 4: Simplify right side
    482.09x = 189,984.01
  5. Step 5: Solve for x
    x = 189,984.01/482.09
  6. Step 6: Final answer
    x = 394.09

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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.