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Finding the Fourth Proportional to 19,991.20, 29,997.60 and 8,899.60

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Solution

The fourth proportional to 19,991.20, 29,997.60 and 8,899.60 is: 13,354.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,991.20 : 29,997.60 = 8,899.60 : x
  2. Step 2: Convert to fraction form
    19,991.20/29,997.60 = 8,899.60/x
  3. Step 3: Cross multiply
    19,991.20x = 29,997.60 × 8,899.60
  4. Step 4: Simplify right side
    19,991.20x = 266,966,640.96
  5. Step 5: Solve for x
    x = 266,966,640.96/19,991.20
  6. Step 6: Final answer
    x = 13,354.21

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1.5x scale

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.