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Finding the Fourth Proportional to 351.51, 485.76 and 285

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Solution

The fourth proportional to 351.51, 485.76 and 285 is: 393.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.51 : 485.76 = 285 : x
  2. Step 2: Convert to fraction form
    351.51/485.76 = 285/x
  3. Step 3: Cross multiply
    351.51x = 485.76 × 285
  4. Step 4: Simplify right side
    351.51x = 138,441.60
  5. Step 5: Solve for x
    x = 138,441.60/351.51
  6. Step 6: Final answer
    x = 393.85

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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.