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Finding the Fourth Proportional to 8,279.99, 12,429.21 and 4,118.88

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Solution

The fourth proportional to 8,279.99, 12,429.21 and 4,118.88 is: 6,182.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,279.99 : 12,429.21 = 4,118.88 : x
  2. Step 2: Convert to fraction form
    8,279.99/12,429.21 = 4,118.88/x
  3. Step 3: Cross multiply
    8,279.99x = 12,429.21 × 4,118.88
  4. Step 4: Simplify right side
    8,279.99x = 51,194,424.48
  5. Step 5: Solve for x
    x = 51,194,424.48/8,279.99
  6. Step 6: Final answer
    x = 6,182.91

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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.