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Finding the Fourth Proportional to 20,921.82, 28,872.01 and 11,361.63

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Solution

The fourth proportional to 20,921.82, 28,872.01 and 11,361.63 is: 15,678.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.82 : 28,872.01 = 11,361.63 : x
  2. Step 2: Convert to fraction form
    20,921.82/28,872.01 = 11,361.63/x
  3. Step 3: Cross multiply
    20,921.82x = 28,872.01 × 11,361.63
  4. Step 4: Simplify right side
    20,921.82x = 328,033,094.98
  5. Step 5: Solve for x
    x = 328,033,094.98/20,921.82
  6. Step 6: Final answer
    x = 15,678.99

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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.