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Finding the Fourth Proportional to 20,911.01, 28,857.12 and 11,350.90

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Solution

The fourth proportional to 20,911.01, 28,857.12 and 11,350.90 is: 15,664.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.01 : 28,857.12 = 11,350.90 : x
  2. Step 2: Convert to fraction form
    20,911.01/28,857.12 = 11,350.90/x
  3. Step 3: Cross multiply
    20,911.01x = 28,857.12 × 11,350.90
  4. Step 4: Simplify right side
    20,911.01x = 327,554,283.41
  5. Step 5: Solve for x
    x = 327,554,283.41/20,911.01
  6. Step 6: Final answer
    x = 15,664.20

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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.