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Finding the Fourth Proportional to 13,699.78, 18,899.20 and 8,917.98

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Solution

The fourth proportional to 13,699.78, 18,899.20 and 8,917.98 is: 12,302.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,699.78 : 18,899.20 = 8,917.98 : x
  2. Step 2: Convert to fraction form
    13,699.78/18,899.20 = 8,917.98/x
  3. Step 3: Cross multiply
    13,699.78x = 18,899.20 × 8,917.98
  4. Step 4: Simplify right side
    13,699.78x = 168,542,687.62
  5. Step 5: Solve for x
    x = 168,542,687.62/13,699.78
  6. Step 6: Final answer
    x = 12,302.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.