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Finding the Fourth Proportional to 20,999.40, 28,903.14 and 19,789.80

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Solution

The fourth proportional to 20,999.40, 28,903.14 and 19,789.80 is: 27,238.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.40 : 28,903.14 = 19,789.80 : x
  2. Step 2: Convert to fraction form
    20,999.40/28,903.14 = 19,789.80/x
  3. Step 3: Cross multiply
    20,999.40x = 28,903.14 × 19,789.80
  4. Step 4: Simplify right side
    20,999.40x = 571,987,359.97
  5. Step 5: Solve for x
    x = 571,987,359.97/20,999.40
  6. Step 6: Final answer
    x = 27,238.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.