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Finding the Fourth Proportional to 352.78, 485.71 and 282.58

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Solution

The fourth proportional to 352.78, 485.71 and 282.58 is: 389.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.78 : 485.71 = 282.58 : x
  2. Step 2: Convert to fraction form
    352.78/485.71 = 282.58/x
  3. Step 3: Cross multiply
    352.78x = 485.71 × 282.58
  4. Step 4: Simplify right side
    352.78x = 137,253.15
  5. Step 5: Solve for x
    x = 137,253.15/352.78
  6. Step 6: Final answer
    x = 389.06

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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.