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Finding the Fourth Proportional to 291.62, 437.92 and 278.64

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Solution

The fourth proportional to 291.62, 437.92 and 278.64 is: 418.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.62 : 437.92 = 278.64 : x
  2. Step 2: Convert to fraction form
    291.62/437.92 = 278.64/x
  3. Step 3: Cross multiply
    291.62x = 437.92 × 278.64
  4. Step 4: Simplify right side
    291.62x = 122,021.33
  5. Step 5: Solve for x
    x = 122,021.33/291.62
  6. Step 6: Final answer
    x = 418.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.