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Finding the Fourth Proportional to 855.91, 1,283.87 and 278.79

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Solution

The fourth proportional to 855.91, 1,283.87 and 278.79 is: 418.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.91 : 1,283.87 = 278.79 : x
  2. Step 2: Convert to fraction form
    855.91/1,283.87 = 278.79/x
  3. Step 3: Cross multiply
    855.91x = 1,283.87 × 278.79
  4. Step 4: Simplify right side
    855.91x = 357,924.39
  5. Step 5: Solve for x
    x = 357,924.39/855.91
  6. Step 6: Final answer
    x = 418.18

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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.