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Finding the Fourth Proportional to 393.76, 590.83 and 278.94

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Solution

The fourth proportional to 393.76, 590.83 and 278.94 is: 418.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.76 : 590.83 = 278.94 : x
  2. Step 2: Convert to fraction form
    393.76/590.83 = 278.94/x
  3. Step 3: Cross multiply
    393.76x = 590.83 × 278.94
  4. Step 4: Simplify right side
    393.76x = 164,805.42
  5. Step 5: Solve for x
    x = 164,805.42/393.76
  6. Step 6: Final answer
    x = 418.55

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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.