Home / 20,702.89-31,020.31-11,945.17

Finding the Fourth Proportional to 20,702.89, 31,020.31 and 11,945.17

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Solution

The fourth proportional to 20,702.89, 31,020.31 and 11,945.17 is: 17,898.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,702.89 : 31,020.31 = 11,945.17 : x
  2. Step 2: Convert to fraction form
    20,702.89/31,020.31 = 11,945.17/x
  3. Step 3: Cross multiply
    20,702.89x = 31,020.31 × 11,945.17
  4. Step 4: Simplify right side
    20,702.89x = 370,542,876.40
  5. Step 5: Solve for x
    x = 370,542,876.40/20,702.89
  6. Step 6: Final answer
    x = 17,898.12

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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.