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Finding the Fourth Proportional to 128,599.43, 192,828.67 and 39,828.29

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Solution

The fourth proportional to 128,599.43, 192,828.67 and 39,828.29 is: 59,720.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,599.43 : 192,828.67 = 39,828.29 : x
  2. Step 2: Convert to fraction form
    128,599.43/192,828.67 = 39,828.29/x
  3. Step 3: Cross multiply
    128,599.43x = 192,828.67 × 39,828.29
  4. Step 4: Simplify right side
    128,599.43x = 7,680,035,707.00
  5. Step 5: Solve for x
    x = 7,680,035,707.00/128,599.43
  6. Step 6: Final answer
    x = 59,720.61

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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.