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Finding the Fourth Proportional to 128,719.70, 193,079.55 and 86,729.30

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Solution

The fourth proportional to 128,719.70, 193,079.55 and 86,729.30 is: 130,093.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,719.70 : 193,079.55 = 86,729.30 : x
  2. Step 2: Convert to fraction form
    128,719.70/193,079.55 = 86,729.30/x
  3. Step 3: Cross multiply
    128,719.70x = 193,079.55 × 86,729.30
  4. Step 4: Simplify right side
    128,719.70x = 16,745,654,215.82
  5. Step 5: Solve for x
    x = 16,745,654,215.82/128,719.70
  6. Step 6: Final answer
    x = 130,093.95

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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.