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Finding the Fourth Proportional to 20,892.80, 28,817.20 and 12,938.80

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Solution

The fourth proportional to 20,892.80, 28,817.20 and 12,938.80 is: 17,846.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,892.80 : 28,817.20 = 12,938.80 : x
  2. Step 2: Convert to fraction form
    20,892.80/28,817.20 = 12,938.80/x
  3. Step 3: Cross multiply
    20,892.80x = 28,817.20 × 12,938.80
  4. Step 4: Simplify right side
    20,892.80x = 372,859,987.36
  5. Step 5: Solve for x
    x = 372,859,987.36/20,892.80
  6. Step 6: Final answer
    x = 17,846.34

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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.