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Finding the Fourth Proportional to 99,489.20, 149,136.60 and 88,991.60

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Solution

The fourth proportional to 99,489.20, 149,136.60 and 88,991.60 is: 133,400.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,489.20 : 149,136.60 = 88,991.60 : x
  2. Step 2: Convert to fraction form
    99,489.20/149,136.60 = 88,991.60/x
  3. Step 3: Cross multiply
    99,489.20x = 149,136.60 × 88,991.60
  4. Step 4: Simplify right side
    99,489.20x = 13,271,904,652.56
  5. Step 5: Solve for x
    x = 13,271,904,652.56/99,489.20
  6. Step 6: Final answer
    x = 133,400.46

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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.