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Finding the Fourth Proportional to 685.48, 1,028.35 and 223.22

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Solution

The fourth proportional to 685.48, 1,028.35 and 223.22 is: 334.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.48 : 1,028.35 = 223.22 : x
  2. Step 2: Convert to fraction form
    685.48/1,028.35 = 223.22/x
  3. Step 3: Cross multiply
    685.48x = 1,028.35 × 223.22
  4. Step 4: Simplify right side
    685.48x = 229,548.29
  5. Step 5: Solve for x
    x = 229,548.29/685.48
  6. Step 6: Final answer
    x = 334.87

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Double scale
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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.