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Finding the Fourth Proportional to 351.96, 485.19 and 278.16

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Solution

The fourth proportional to 351.96, 485.19 and 278.16 is: 383.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.96 : 485.19 = 278.16 : x
  2. Step 2: Convert to fraction form
    351.96/485.19 = 278.16/x
  3. Step 3: Cross multiply
    351.96x = 485.19 × 278.16
  4. Step 4: Simplify right side
    351.96x = 134,960.45
  5. Step 5: Solve for x
    x = 134,960.45/351.96
  6. Step 6: Final answer
    x = 383.45

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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.