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Finding the Fourth Proportional to 21,611, 29,760 and 20,700.56

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Solution

The fourth proportional to 21,611, 29,760 and 20,700.56 is: 28,506.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,611 : 29,760 = 20,700.56 : x
  2. Step 2: Convert to fraction form
    21,611/29,760 = 20,700.56/x
  3. Step 3: Cross multiply
    21,611x = 29,760 × 20,700.56
  4. Step 4: Simplify right side
    21,611x = 616,048,665.60
  5. Step 5: Solve for x
    x = 616,048,665.60/21,611
  6. Step 6: Final answer
    x = 28,506.25

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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.