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Finding the Fourth Proportional to 8,668.95, 12,995.52 and 3,120.99

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Solution

The fourth proportional to 8,668.95, 12,995.52 and 3,120.99 is: 4,678.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,668.95 : 12,995.52 = 3,120.99 : x
  2. Step 2: Convert to fraction form
    8,668.95/12,995.52 = 3,120.99/x
  3. Step 3: Cross multiply
    8,668.95x = 12,995.52 × 3,120.99
  4. Step 4: Simplify right side
    8,668.95x = 40,558,887.96
  5. Step 5: Solve for x
    x = 40,558,887.96/8,668.95
  6. Step 6: Final answer
    x = 4,678.64

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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.