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Finding the Fourth Proportional to 85,855.20, 128,928.60 and 63,693.60

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Solution

The fourth proportional to 85,855.20, 128,928.60 and 63,693.60 is: 95,648.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,855.20 : 128,928.60 = 63,693.60 : x
  2. Step 2: Convert to fraction form
    85,855.20/128,928.60 = 63,693.60/x
  3. Step 3: Cross multiply
    85,855.20x = 128,928.60 × 63,693.60
  4. Step 4: Simplify right side
    85,855.20x = 8,211,926,676.96
  5. Step 5: Solve for x
    x = 8,211,926,676.96/85,855.20
  6. Step 6: Final answer
    x = 95,648.56

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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.