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Finding the Fourth Proportional to 361.15, 498.61 and 278.09

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Solution

The fourth proportional to 361.15, 498.61 and 278.09 is: 383.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.15 : 498.61 = 278.09 : x
  2. Step 2: Convert to fraction form
    361.15/498.61 = 278.09/x
  3. Step 3: Cross multiply
    361.15x = 498.61 × 278.09
  4. Step 4: Simplify right side
    361.15x = 138,658.45
  5. Step 5: Solve for x
    x = 138,658.45/361.15
  6. Step 6: Final answer
    x = 383.94

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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.