Home / 19,920.39-29,880.94-5,129.61

Finding the Fourth Proportional to 19,920.39, 29,880.94 and 5,129.61

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Solution

The fourth proportional to 19,920.39, 29,880.94 and 5,129.61 is: 7,694.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.39 : 29,880.94 = 5,129.61 : x
  2. Step 2: Convert to fraction form
    19,920.39/29,880.94 = 5,129.61/x
  3. Step 3: Cross multiply
    19,920.39x = 29,880.94 × 5,129.61
  4. Step 4: Simplify right side
    19,920.39x = 153,277,568.63
  5. Step 5: Solve for x
    x = 153,277,568.63/19,920.39
  6. Step 6: Final answer
    x = 7,694.51

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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.