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Finding the Fourth Proportional to 685.19, 1,027.15 and 222.65

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Solution

The fourth proportional to 685.19, 1,027.15 and 222.65 is: 333.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.19 : 1,027.15 = 222.65 : x
  2. Step 2: Convert to fraction form
    685.19/1,027.15 = 222.65/x
  3. Step 3: Cross multiply
    685.19x = 1,027.15 × 222.65
  4. Step 4: Simplify right side
    685.19x = 228,693.11
  5. Step 5: Solve for x
    x = 228,693.11/685.19
  6. Step 6: Final answer
    x = 333.76

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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.