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Finding the Fourth Proportional to 849.20, 1,273.80 and 387.11

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Solution

The fourth proportional to 849.20, 1,273.80 and 387.11 is: 580.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.20 : 1,273.80 = 387.11 : x
  2. Step 2: Convert to fraction form
    849.20/1,273.80 = 387.11/x
  3. Step 3: Cross multiply
    849.20x = 1,273.80 × 387.11
  4. Step 4: Simplify right side
    849.20x = 493,100.97
  5. Step 5: Solve for x
    x = 493,100.97/849.20
  6. Step 6: Final answer
    x = 580.67

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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.