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Finding the Fourth Proportional to 85,416.40, 128,221.80 and 50,375.80

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Solution

The fourth proportional to 85,416.40, 128,221.80 and 50,375.80 is: 75,621.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,416.40 : 128,221.80 = 50,375.80 : x
  2. Step 2: Convert to fraction form
    85,416.40/128,221.80 = 50,375.80/x
  3. Step 3: Cross multiply
    85,416.40x = 128,221.80 × 50,375.80
  4. Step 4: Simplify right side
    85,416.40x = 6,459,275,752.44
  5. Step 5: Solve for x
    x = 6,459,275,752.44/85,416.40
  6. Step 6: Final answer
    x = 75,621.03

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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.