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Finding the Fourth Proportional to 8,579.92, 12,870.02 and 3,385.75

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Solution

The fourth proportional to 8,579.92, 12,870.02 and 3,385.75 is: 5,078.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,579.92 : 12,870.02 = 3,385.75 : x
  2. Step 2: Convert to fraction form
    8,579.92/12,870.02 = 3,385.75/x
  3. Step 3: Cross multiply
    8,579.92x = 12,870.02 × 3,385.75
  4. Step 4: Simplify right side
    8,579.92x = 43,574,670.22
  5. Step 5: Solve for x
    x = 43,574,670.22/8,579.92
  6. Step 6: Final answer
    x = 5,078.68

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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.