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Finding the Fourth Proportional to 482.22, 665.78 and 285.80

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Solution

The fourth proportional to 482.22, 665.78 and 285.80 is: 394.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.22 : 665.78 = 285.80 : x
  2. Step 2: Convert to fraction form
    482.22/665.78 = 285.80/x
  3. Step 3: Cross multiply
    482.22x = 665.78 × 285.80
  4. Step 4: Simplify right side
    482.22x = 190,275.17
  5. Step 5: Solve for x
    x = 190,275.17/482.22
  6. Step 6: Final answer
    x = 394.58

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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.