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Finding the Fourth Proportional to 20,943.90, 28,900.80 and 11,512.80

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Solution

The fourth proportional to 20,943.90, 28,900.80 and 11,512.80 is: 15,886.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,943.90 : 28,900.80 = 11,512.80 : x
  2. Step 2: Convert to fraction form
    20,943.90/28,900.80 = 11,512.80/x
  3. Step 3: Cross multiply
    20,943.90x = 28,900.80 × 11,512.80
  4. Step 4: Simplify right side
    20,943.90x = 332,729,130.24
  5. Step 5: Solve for x
    x = 332,729,130.24/20,943.90
  6. Step 6: Final answer
    x = 15,886.68

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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.