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Finding the Fourth Proportional to 18,760, 25,888.80 and 12,136

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Solution

The fourth proportional to 18,760, 25,888.80 and 12,136 is: 16,747.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,760 : 25,888.80 = 12,136 : x
  2. Step 2: Convert to fraction form
    18,760/25,888.80 = 12,136/x
  3. Step 3: Cross multiply
    18,760x = 25,888.80 × 12,136
  4. Step 4: Simplify right side
    18,760x = 314,186,476.80
  5. Step 5: Solve for x
    x = 314,186,476.80/18,760
  6. Step 6: Final answer
    x = 16,747.68

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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.