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Finding the Fourth Proportional to 99,817.92, 149,629.68 and 81,136.08

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Solution

The fourth proportional to 99,817.92, 149,629.68 and 81,136.08 is: 121,625.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,817.92 : 149,629.68 = 81,136.08 : x
  2. Step 2: Convert to fraction form
    99,817.92/149,629.68 = 81,136.08/x
  3. Step 3: Cross multiply
    99,817.92x = 149,629.68 × 81,136.08
  4. Step 4: Simplify right side
    99,817.92x = 12,140,365,686.85
  5. Step 5: Solve for x
    x = 12,140,365,686.85/99,817.92
  6. Step 6: Final answer
    x = 121,625.11

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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.