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Finding the Fourth Proportional to 28,080.39, 42,108.90 and 11,429.13

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Solution

The fourth proportional to 28,080.39, 42,108.90 and 11,429.13 is: 17,138.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,080.39 : 42,108.90 = 11,429.13 : x
  2. Step 2: Convert to fraction form
    28,080.39/42,108.90 = 11,429.13/x
  3. Step 3: Cross multiply
    28,080.39x = 42,108.90 × 11,429.13
  4. Step 4: Simplify right side
    28,080.39x = 481,268,092.26
  5. Step 5: Solve for x
    x = 481,268,092.26/28,080.39
  6. Step 6: Final answer
    x = 17,138.94

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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.