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Finding the Fourth Proportional to 8,619.76, 12,930.38 and 2,379.77

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Solution

The fourth proportional to 8,619.76, 12,930.38 and 2,379.77 is: 3,569.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,619.76 : 12,930.38 = 2,379.77 : x
  2. Step 2: Convert to fraction form
    8,619.76/12,930.38 = 2,379.77/x
  3. Step 3: Cross multiply
    8,619.76x = 12,930.38 × 2,379.77
  4. Step 4: Simplify right side
    8,619.76x = 30,771,330.41
  5. Step 5: Solve for x
    x = 30,771,330.41/8,619.76
  6. Step 6: Final answer
    x = 3,569.86

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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.