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Finding the Fourth Proportional to 351.87, 485.35 and 278.16

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Solution

The fourth proportional to 351.87, 485.35 and 278.16 is: 383.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.87 : 485.35 = 278.16 : x
  2. Step 2: Convert to fraction form
    351.87/485.35 = 278.16/x
  3. Step 3: Cross multiply
    351.87x = 485.35 × 278.16
  4. Step 4: Simplify right side
    351.87x = 135,004.96
  5. Step 5: Solve for x
    x = 135,004.96/351.87
  6. Step 6: Final answer
    x = 383.68

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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.