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Finding the Fourth Proportional to 20,882.80, 28,801.50 and 18,359.56

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Solution

The fourth proportional to 20,882.80, 28,801.50 and 18,359.56 is: 25,321.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,882.80 : 28,801.50 = 18,359.56 : x
  2. Step 2: Convert to fraction form
    20,882.80/28,801.50 = 18,359.56/x
  3. Step 3: Cross multiply
    20,882.80x = 28,801.50 × 18,359.56
  4. Step 4: Simplify right side
    20,882.80x = 528,782,867.34
  5. Step 5: Solve for x
    x = 528,782,867.34/20,882.80
  6. Step 6: Final answer
    x = 25,321.45

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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.