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Finding the Fourth Proportional to 128,907.70, 193,361.55 and 86,917.30

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Solution

The fourth proportional to 128,907.70, 193,361.55 and 86,917.30 is: 130,375.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,907.70 : 193,361.55 = 86,917.30 : x
  2. Step 2: Convert to fraction form
    128,907.70/193,361.55 = 86,917.30/x
  3. Step 3: Cross multiply
    128,907.70x = 193,361.55 × 86,917.30
  4. Step 4: Simplify right side
    128,907.70x = 16,806,463,849.82
  5. Step 5: Solve for x
    x = 16,806,463,849.82/128,907.70
  6. Step 6: Final answer
    x = 130,375.95

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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.