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Finding the Fourth Proportional to 482.22, 665.40 and 285.78

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Solution

The fourth proportional to 482.22, 665.40 and 285.78 is: 394.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.22 : 665.40 = 285.78 : x
  2. Step 2: Convert to fraction form
    482.22/665.40 = 285.78/x
  3. Step 3: Cross multiply
    482.22x = 665.40 × 285.78
  4. Step 4: Simplify right side
    482.22x = 190,158.01
  5. Step 5: Solve for x
    x = 190,158.01/482.22
  6. Step 6: Final answer
    x = 394.34

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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.