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Finding the Fourth Proportional to 128,836.32, 192,885.84 and 87,208.80

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Solution

The fourth proportional to 128,836.32, 192,885.84 and 87,208.80 is: 130,563.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,836.32 : 192,885.84 = 87,208.80 : x
  2. Step 2: Convert to fraction form
    128,836.32/192,885.84 = 87,208.80/x
  3. Step 3: Cross multiply
    128,836.32x = 192,885.84 × 87,208.80
  4. Step 4: Simplify right side
    128,836.32x = 16,821,342,643.39
  5. Step 5: Solve for x
    x = 16,821,342,643.39/128,836.32
  6. Step 6: Final answer
    x = 130,563.67

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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.