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Finding the Fourth Proportional to 21,748.20, 30,043.56 and 20,173.56

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Solution

The fourth proportional to 21,748.20, 30,043.56 and 20,173.56 is: 27,868.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,748.20 : 30,043.56 = 20,173.56 : x
  2. Step 2: Convert to fraction form
    21,748.20/30,043.56 = 20,173.56/x
  3. Step 3: Cross multiply
    21,748.20x = 30,043.56 × 20,173.56
  4. Step 4: Simplify right side
    21,748.20x = 606,085,560.27
  5. Step 5: Solve for x
    x = 606,085,560.27/21,748.20
  6. Step 6: Final answer
    x = 27,868.31

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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.