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Finding the Fourth Proportional to 21,858.85, 32,790.10 and 8,704.05

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Solution

The fourth proportional to 21,858.85, 32,790.10 and 8,704.05 is: 13,056.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,858.85 : 32,790.10 = 8,704.05 : x
  2. Step 2: Convert to fraction form
    21,858.85/32,790.10 = 8,704.05/x
  3. Step 3: Cross multiply
    21,858.85x = 32,790.10 × 8,704.05
  4. Step 4: Simplify right side
    21,858.85x = 285,406,669.91
  5. Step 5: Solve for x
    x = 285,406,669.91/21,858.85
  6. Step 6: Final answer
    x = 13,056.80

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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.