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Finding the Fourth Proportional to 85,375.60, 128,063.40 and 43,903.60

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Solution

The fourth proportional to 85,375.60, 128,063.40 and 43,903.60 is: 65,855.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,375.60 : 128,063.40 = 43,903.60 : x
  2. Step 2: Convert to fraction form
    85,375.60/128,063.40 = 43,903.60/x
  3. Step 3: Cross multiply
    85,375.60x = 128,063.40 × 43,903.60
  4. Step 4: Simplify right side
    85,375.60x = 5,622,444,288.24
  5. Step 5: Solve for x
    x = 5,622,444,288.24/85,375.60
  6. Step 6: Final answer
    x = 65,855.40

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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.