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Finding the Fourth Proportional to 99,781.80, 149,745.60 and 66,490.80

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Solution

The fourth proportional to 99,781.80, 149,745.60 and 66,490.80 is: 99,784.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,781.80 : 149,745.60 = 66,490.80 : x
  2. Step 2: Convert to fraction form
    99,781.80/149,745.60 = 66,490.80/x
  3. Step 3: Cross multiply
    99,781.80x = 149,745.60 × 66,490.80
  4. Step 4: Simplify right side
    99,781.80x = 9,956,704,740.48
  5. Step 5: Solve for x
    x = 9,956,704,740.48/99,781.80
  6. Step 6: Final answer
    x = 99,784.78

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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.