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Finding the Fourth Proportional to 139,689.84, 192,771.99 and 76,028.10

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Solution

The fourth proportional to 139,689.84, 192,771.99 and 76,028.10 is: 104,918.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,689.84 : 192,771.99 = 76,028.10 : x
  2. Step 2: Convert to fraction form
    139,689.84/192,771.99 = 76,028.10/x
  3. Step 3: Cross multiply
    139,689.84x = 192,771.99 × 76,028.10
  4. Step 4: Simplify right side
    139,689.84x = 14,656,087,410.02
  5. Step 5: Solve for x
    x = 14,656,087,410.02/139,689.84
  6. Step 6: Final answer
    x = 104,918.78

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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.