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Finding the Fourth Proportional to 685.51, 1,028.22 and 252.63

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Solution

The fourth proportional to 685.51, 1,028.22 and 252.63 is: 378.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.51 : 1,028.22 = 252.63 : x
  2. Step 2: Convert to fraction form
    685.51/1,028.22 = 252.63/x
  3. Step 3: Cross multiply
    685.51x = 1,028.22 × 252.63
  4. Step 4: Simplify right side
    685.51x = 259,754.08
  5. Step 5: Solve for x
    x = 259,754.08/685.51
  6. Step 6: Final answer
    x = 378.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.