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Finding the Fourth Proportional to 12,688.99, 19,027.49 and 3,800.90

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Solution

The fourth proportional to 12,688.99, 19,027.49 and 3,800.90 is: 5,699.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,688.99 : 19,027.49 = 3,800.90 : x
  2. Step 2: Convert to fraction form
    12,688.99/19,027.49 = 3,800.90/x
  3. Step 3: Cross multiply
    12,688.99x = 19,027.49 × 3,800.90
  4. Step 4: Simplify right side
    12,688.99x = 72,321,586.74
  5. Step 5: Solve for x
    x = 72,321,586.74/12,688.99
  6. Step 6: Final answer
    x = 5,699.55

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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.