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Finding the Fourth Proportional to 28,961.80, 43,394.10 and 14,138.80

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Solution

The fourth proportional to 28,961.80, 43,394.10 and 14,138.80 is: 21,184.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,961.80 : 43,394.10 = 14,138.80 : x
  2. Step 2: Convert to fraction form
    28,961.80/43,394.10 = 14,138.80/x
  3. Step 3: Cross multiply
    28,961.80x = 43,394.10 × 14,138.80
  4. Step 4: Simplify right side
    28,961.80x = 613,540,501.08
  5. Step 5: Solve for x
    x = 613,540,501.08/28,961.80
  6. Step 6: Final answer
    x = 21,184.47

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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.