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Finding the Fourth Proportional to 139,718.94, 192,812.16 and 76,057.21

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Solution

The fourth proportional to 139,718.94, 192,812.16 and 76,057.21 is: 104,958.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,718.94 : 192,812.16 = 76,057.21 : x
  2. Step 2: Convert to fraction form
    139,718.94/192,812.16 = 76,057.21/x
  3. Step 3: Cross multiply
    139,718.94x = 192,812.16 × 76,057.21
  4. Step 4: Simplify right side
    139,718.94x = 14,664,754,943.67
  5. Step 5: Solve for x
    x = 14,664,754,943.67/139,718.94
  6. Step 6: Final answer
    x = 104,958.96

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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.