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Finding the Fourth Proportional to 21,874.60, 30,186.94 and 11,938.60

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Solution

The fourth proportional to 21,874.60, 30,186.94 and 11,938.60 is: 16,475.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,874.60 : 30,186.94 = 11,938.60 : x
  2. Step 2: Convert to fraction form
    21,874.60/30,186.94 = 11,938.60/x
  3. Step 3: Cross multiply
    21,874.60x = 30,186.94 × 11,938.60
  4. Step 4: Simplify right side
    21,874.60x = 360,389,801.88
  5. Step 5: Solve for x
    x = 360,389,801.88/21,874.60
  6. Step 6: Final answer
    x = 16,475.26

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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.