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Finding the Fourth Proportional to 99,809.20, 149,713.80 and 80,126.20

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Solution

The fourth proportional to 99,809.20, 149,713.80 and 80,126.20 is: 120,189.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,809.20 : 149,713.80 = 80,126.20 : x
  2. Step 2: Convert to fraction form
    99,809.20/149,713.80 = 80,126.20/x
  3. Step 3: Cross multiply
    99,809.20x = 149,713.80 × 80,126.20
  4. Step 4: Simplify right side
    99,809.20x = 11,995,997,881.56
  5. Step 5: Solve for x
    x = 11,995,997,881.56/99,809.20
  6. Step 6: Final answer
    x = 120,189.30

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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.