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Finding the Fourth Proportional to 351.36, 485.28 and 286.20

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Solution

The fourth proportional to 351.36, 485.28 and 286.20 is: 395.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.36 : 485.28 = 286.20 : x
  2. Step 2: Convert to fraction form
    351.36/485.28 = 286.20/x
  3. Step 3: Cross multiply
    351.36x = 485.28 × 286.20
  4. Step 4: Simplify right side
    351.36x = 138,887.14
  5. Step 5: Solve for x
    x = 138,887.14/351.36
  6. Step 6: Final answer
    x = 395.28

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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.