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Finding the Fourth Proportional to 18,689, 25,790.82 and 11,237

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Solution

The fourth proportional to 18,689, 25,790.82 and 11,237 is: 15,507.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689 : 25,790.82 = 11,237 : x
  2. Step 2: Convert to fraction form
    18,689/25,790.82 = 11,237/x
  3. Step 3: Cross multiply
    18,689x = 25,790.82 × 11,237
  4. Step 4: Simplify right side
    18,689x = 289,811,444.34
  5. Step 5: Solve for x
    x = 289,811,444.34/18,689
  6. Step 6: Final answer
    x = 15,507.06

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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.