Home / 20,689.72-31,042.07-12,783

Finding the Fourth Proportional to 20,689.72, 31,042.07 and 12,783

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Solution

The fourth proportional to 20,689.72, 31,042.07 and 12,783 is: 19,179.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.72 : 31,042.07 = 12,783 : x
  2. Step 2: Convert to fraction form
    20,689.72/31,042.07 = 12,783/x
  3. Step 3: Cross multiply
    20,689.72x = 31,042.07 × 12,783
  4. Step 4: Simplify right side
    20,689.72x = 396,810,780.81
  5. Step 5: Solve for x
    x = 396,810,780.81/20,689.72
  6. Step 6: Final answer
    x = 19,179.13

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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.