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Finding the Fourth Proportional to 18,720.80, 28,048.80 and 16,128.80

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Solution

The fourth proportional to 18,720.80, 28,048.80 and 16,128.80 is: 24,165.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.80 : 28,048.80 = 16,128.80 : x
  2. Step 2: Convert to fraction form
    18,720.80/28,048.80 = 16,128.80/x
  3. Step 3: Cross multiply
    18,720.80x = 28,048.80 × 16,128.80
  4. Step 4: Simplify right side
    18,720.80x = 452,393,485.44
  5. Step 5: Solve for x
    x = 452,393,485.44/18,720.80
  6. Step 6: Final answer
    x = 24,165.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.