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Finding the Fourth Proportional to 28,187.80, 38,880.43 and 18,128.97

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Solution

The fourth proportional to 28,187.80, 38,880.43 and 18,128.97 is: 25,005.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,187.80 : 38,880.43 = 18,128.97 : x
  2. Step 2: Convert to fraction form
    28,187.80/38,880.43 = 18,128.97/x
  3. Step 3: Cross multiply
    28,187.80x = 38,880.43 × 18,128.97
  4. Step 4: Simplify right side
    28,187.80x = 704,862,103.73
  5. Step 5: Solve for x
    x = 704,862,103.73/28,187.80
  6. Step 6: Final answer
    x = 25,005.93

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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.