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Finding the Fourth Proportional to 128,834.40, 193,251.60 and 76,216.80

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Solution

The fourth proportional to 128,834.40, 193,251.60 and 76,216.80 is: 114,325.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,834.40 : 193,251.60 = 76,216.80 : x
  2. Step 2: Convert to fraction form
    128,834.40/193,251.60 = 76,216.80/x
  3. Step 3: Cross multiply
    128,834.40x = 193,251.60 × 76,216.80
  4. Step 4: Simplify right side
    128,834.40x = 14,729,018,546.88
  5. Step 5: Solve for x
    x = 14,729,018,546.88/128,834.40
  6. Step 6: Final answer
    x = 114,325.20

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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.