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Finding the Fourth Proportional to 2,590.96, 3,885.16 and 859

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Solution

The fourth proportional to 2,590.96, 3,885.16 and 859 is: 1,288.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,590.96 : 3,885.16 = 859 : x
  2. Step 2: Convert to fraction form
    2,590.96/3,885.16 = 859/x
  3. Step 3: Cross multiply
    2,590.96x = 3,885.16 × 859
  4. Step 4: Simplify right side
    2,590.96x = 3,337,352.44
  5. Step 5: Solve for x
    x = 3,337,352.44/2,590.96
  6. Step 6: Final answer
    x = 1,288.08

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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.