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Finding the Fourth Proportional to 21,672.28, 29,907.39 and 12,112.39

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Solution

The fourth proportional to 21,672.28, 29,907.39 and 12,112.39 is: 16,714.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,672.28 : 29,907.39 = 12,112.39 : x
  2. Step 2: Convert to fraction form
    21,672.28/29,907.39 = 12,112.39/x
  3. Step 3: Cross multiply
    21,672.28x = 29,907.39 × 12,112.39
  4. Step 4: Simplify right side
    21,672.28x = 362,249,971.56
  5. Step 5: Solve for x
    x = 362,249,971.56/21,672.28
  6. Step 6: Final answer
    x = 16,714.90

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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.