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Finding the Fourth Proportional to 85,558.40, 128,143.20 and 54,065.60

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Solution

The fourth proportional to 85,558.40, 128,143.20 and 54,065.60 is: 80,975.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,558.40 : 128,143.20 = 54,065.60 : x
  2. Step 2: Convert to fraction form
    85,558.40/128,143.20 = 54,065.60/x
  3. Step 3: Cross multiply
    85,558.40x = 128,143.20 × 54,065.60
  4. Step 4: Simplify right side
    85,558.40x = 6,928,138,993.92
  5. Step 5: Solve for x
    x = 6,928,138,993.92/85,558.40
  6. Step 6: Final answer
    x = 80,975.56

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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.