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Finding the Fourth Proportional to 685.10, 1,027.54 and 223.21

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Solution

The fourth proportional to 685.10, 1,027.54 and 223.21 is: 334.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.10 : 1,027.54 = 223.21 : x
  2. Step 2: Convert to fraction form
    685.10/1,027.54 = 223.21/x
  3. Step 3: Cross multiply
    685.10x = 1,027.54 × 223.21
  4. Step 4: Simplify right side
    685.10x = 229,358.77
  5. Step 5: Solve for x
    x = 229,358.77/685.10
  6. Step 6: Final answer
    x = 334.78

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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.