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Finding the Fourth Proportional to 21,808, 30,095.68 and 11,872.64

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Solution

The fourth proportional to 21,808, 30,095.68 and 11,872.64 is: 16,384.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,808 : 30,095.68 = 11,872.64 : x
  2. Step 2: Convert to fraction form
    21,808/30,095.68 = 11,872.64/x
  3. Step 3: Cross multiply
    21,808x = 30,095.68 × 11,872.64
  4. Step 4: Simplify right side
    21,808x = 357,315,174.20
  5. Step 5: Solve for x
    x = 357,315,174.20/21,808
  6. Step 6: Final answer
    x = 16,384.59

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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.