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Finding the Fourth Proportional to 685.19, 1,027.85 and 222.98

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Solution

The fourth proportional to 685.19, 1,027.85 and 222.98 is: 334.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.19 : 1,027.85 = 222.98 : x
  2. Step 2: Convert to fraction form
    685.19/1,027.85 = 222.98/x
  3. Step 3: Cross multiply
    685.19x = 1,027.85 × 222.98
  4. Step 4: Simplify right side
    685.19x = 229,189.99
  5. Step 5: Solve for x
    x = 229,189.99/685.19
  6. Step 6: Final answer
    x = 334.49

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Double scale
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Similar ratio
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1.5x scale

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.