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Finding the Fourth Proportional to 139,028.20, 191,859.90 and 75,367

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Solution

The fourth proportional to 139,028.20, 191,859.90 and 75,367 is: 104,006.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,028.20 : 191,859.90 = 75,367 : x
  2. Step 2: Convert to fraction form
    139,028.20/191,859.90 = 75,367/x
  3. Step 3: Cross multiply
    139,028.20x = 191,859.90 × 75,367
  4. Step 4: Simplify right side
    139,028.20x = 14,459,905,083.30
  5. Step 5: Solve for x
    x = 14,459,905,083.30/139,028.20
  6. Step 6: Final answer
    x = 104,006.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.