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Finding the Fourth Proportional to 609.05, 840.11 and 387.62

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Solution

The fourth proportional to 609.05, 840.11 and 387.62 is: 534.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.05 : 840.11 = 387.62 : x
  2. Step 2: Convert to fraction form
    609.05/840.11 = 387.62/x
  3. Step 3: Cross multiply
    609.05x = 840.11 × 387.62
  4. Step 4: Simplify right side
    609.05x = 325,640.45
  5. Step 5: Solve for x
    x = 325,640.45/609.05
  6. Step 6: Final answer
    x = 534.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.