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Finding the Fourth Proportional to 21,372, 29,492.82 and 11,940.63

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Solution

The fourth proportional to 21,372, 29,492.82 and 11,940.63 is: 16,477.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,372 : 29,492.82 = 11,940.63 : x
  2. Step 2: Convert to fraction form
    21,372/29,492.82 = 11,940.63/x
  3. Step 3: Cross multiply
    21,372x = 29,492.82 × 11,940.63
  4. Step 4: Simplify right side
    21,372x = 352,162,851.28
  5. Step 5: Solve for x
    x = 352,162,851.28/21,372
  6. Step 6: Final answer
    x = 16,477.77

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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.