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Finding the Fourth Proportional to 90,128.80, 135,213.84 and 43,420.96

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Solution

The fourth proportional to 90,128.80, 135,213.84 and 43,420.96 is: 65,141.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,128.80 : 135,213.84 = 43,420.96 : x
  2. Step 2: Convert to fraction form
    90,128.80/135,213.84 = 43,420.96/x
  3. Step 3: Cross multiply
    90,128.80x = 135,213.84 × 43,420.96
  4. Step 4: Simplify right side
    90,128.80x = 5,871,114,738.09
  5. Step 5: Solve for x
    x = 5,871,114,738.09/90,128.80
  6. Step 6: Final answer
    x = 65,141.38

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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.