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Finding the Fourth Proportional to 8,590.30, 12,879.30 and 3,320.80

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Solution

The fourth proportional to 8,590.30, 12,879.30 and 3,320.80 is: 4,978.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,590.30 : 12,879.30 = 3,320.80 : x
  2. Step 2: Convert to fraction form
    8,590.30/12,879.30 = 3,320.80/x
  3. Step 3: Cross multiply
    8,590.30x = 12,879.30 × 3,320.80
  4. Step 4: Simplify right side
    8,590.30x = 42,769,579.44
  5. Step 5: Solve for x
    x = 42,769,579.44/8,590.30
  6. Step 6: Final answer
    x = 4,978.82

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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.