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Finding the Fourth Proportional to 128,604.78, 192,839.13 and 49,639.50

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Solution

The fourth proportional to 128,604.78, 192,839.13 and 49,639.50 is: 74,432.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,604.78 : 192,839.13 = 49,639.50 : x
  2. Step 2: Convert to fraction form
    128,604.78/192,839.13 = 49,639.50/x
  3. Step 3: Cross multiply
    128,604.78x = 192,839.13 × 49,639.50
  4. Step 4: Simplify right side
    128,604.78x = 9,572,437,993.64
  5. Step 5: Solve for x
    x = 9,572,437,993.64/128,604.78
  6. Step 6: Final answer
    x = 74,432.99

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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.