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Finding the Fourth Proportional to 21,379.89, 32,075.79 and 8,905.80

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Solution

The fourth proportional to 21,379.89, 32,075.79 and 8,905.80 is: 13,361.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,379.89 : 32,075.79 = 8,905.80 : x
  2. Step 2: Convert to fraction form
    21,379.89/32,075.79 = 8,905.80/x
  3. Step 3: Cross multiply
    21,379.89x = 32,075.79 × 8,905.80
  4. Step 4: Simplify right side
    21,379.89x = 285,660,570.58
  5. Step 5: Solve for x
    x = 285,660,570.58/21,379.89
  6. Step 6: Final answer
    x = 13,361.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.