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Finding the Fourth Proportional to 99,780.80, 149,744.10 and 66,489.80

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Solution

The fourth proportional to 99,780.80, 149,744.10 and 66,489.80 is: 99,783.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,780.80 : 149,744.10 = 66,489.80 : x
  2. Step 2: Convert to fraction form
    99,780.80/149,744.10 = 66,489.80/x
  3. Step 3: Cross multiply
    99,780.80x = 149,744.10 × 66,489.80
  4. Step 4: Simplify right side
    99,780.80x = 9,956,455,260.18
  5. Step 5: Solve for x
    x = 9,956,455,260.18/99,780.80
  6. Step 6: Final answer
    x = 99,783.28

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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.