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Finding the Fourth Proportional to 80,999.80, 121,353.90 and 66,128.20

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Solution

The fourth proportional to 80,999.80, 121,353.90 and 66,128.20 is: 99,073.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,999.80 : 121,353.90 = 66,128.20 : x
  2. Step 2: Convert to fraction form
    80,999.80/121,353.90 = 66,128.20/x
  3. Step 3: Cross multiply
    80,999.80x = 121,353.90 × 66,128.20
  4. Step 4: Simplify right side
    80,999.80x = 8,024,914,969.98
  5. Step 5: Solve for x
    x = 8,024,914,969.98/80,999.80
  6. Step 6: Final answer
    x = 99,073.27

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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.