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Finding the Fourth Proportional to 2,805.86, 4,208.67 and 858

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Solution

The fourth proportional to 2,805.86, 4,208.67 and 858 is: 1,286.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,805.86 : 4,208.67 = 858 : x
  2. Step 2: Convert to fraction form
    2,805.86/4,208.67 = 858/x
  3. Step 3: Cross multiply
    2,805.86x = 4,208.67 × 858
  4. Step 4: Simplify right side
    2,805.86x = 3,611,038.86
  5. Step 5: Solve for x
    x = 3,611,038.86/2,805.86
  6. Step 6: Final answer
    x = 1,286.97

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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.