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Finding the Fourth Proportional to 351.38, 485.17 and 278.07

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Solution

The fourth proportional to 351.38, 485.17 and 278.07 is: 383.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.38 : 485.17 = 278.07 : x
  2. Step 2: Convert to fraction form
    351.38/485.17 = 278.07/x
  3. Step 3: Cross multiply
    351.38x = 485.17 × 278.07
  4. Step 4: Simplify right side
    351.38x = 134,911.22
  5. Step 5: Solve for x
    x = 134,911.22/351.38
  6. Step 6: Final answer
    x = 383.95

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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.