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Finding the Fourth Proportional to 862.99, 1,294.46 and 278

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Solution

The fourth proportional to 862.99, 1,294.46 and 278 is: 416.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.99 : 1,294.46 = 278 : x
  2. Step 2: Convert to fraction form
    862.99/1,294.46 = 278/x
  3. Step 3: Cross multiply
    862.99x = 1,294.46 × 278
  4. Step 4: Simplify right side
    862.99x = 359,859.88
  5. Step 5: Solve for x
    x = 359,859.88/862.99
  6. Step 6: Final answer
    x = 416.99

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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.