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Finding the Fourth Proportional to 351.83, 485.20 and 268.78

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Solution

The fourth proportional to 351.83, 485.20 and 268.78 is: 370.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.83 : 485.20 = 268.78 : x
  2. Step 2: Convert to fraction form
    351.83/485.20 = 268.78/x
  3. Step 3: Cross multiply
    351.83x = 485.20 × 268.78
  4. Step 4: Simplify right side
    351.83x = 130,410.17
  5. Step 5: Solve for x
    x = 130,410.17/351.83
  6. Step 6: Final answer
    x = 370.67

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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.