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Finding the Fourth Proportional to 21,639, 29,861.82 and 11,703

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Solution

The fourth proportional to 21,639, 29,861.82 and 11,703 is: 16,150.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,639 : 29,861.82 = 11,703 : x
  2. Step 2: Convert to fraction form
    21,639/29,861.82 = 11,703/x
  3. Step 3: Cross multiply
    21,639x = 29,861.82 × 11,703
  4. Step 4: Simplify right side
    21,639x = 349,472,879.46
  5. Step 5: Solve for x
    x = 349,472,879.46/21,639
  6. Step 6: Final answer
    x = 16,150.14

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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.