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Finding the Fourth Proportional to 609.76, 914.64 and 219.78

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Solution

The fourth proportional to 609.76, 914.64 and 219.78 is: 329.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.76 : 914.64 = 219.78 : x
  2. Step 2: Convert to fraction form
    609.76/914.64 = 219.78/x
  3. Step 3: Cross multiply
    609.76x = 914.64 × 219.78
  4. Step 4: Simplify right side
    609.76x = 201,019.58
  5. Step 5: Solve for x
    x = 201,019.58/609.76
  6. Step 6: Final answer
    x = 329.67

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Double scale
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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.