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Finding the Fourth Proportional to 85,690.32, 128,311.92 and 68,958.96

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Solution

The fourth proportional to 85,690.32, 128,311.92 and 68,958.96 is: 103,258.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,690.32 : 128,311.92 = 68,958.96 : x
  2. Step 2: Convert to fraction form
    85,690.32/128,311.92 = 68,958.96/x
  3. Step 3: Cross multiply
    85,690.32x = 128,311.92 × 68,958.96
  4. Step 4: Simplify right side
    85,690.32x = 8,848,256,558.80
  5. Step 5: Solve for x
    x = 8,848,256,558.80/85,690.32
  6. Step 6: Final answer
    x = 103,258.53

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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.