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Finding the Fourth Proportional to 80,352.64, 120,523.96 and 21,187

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Solution

The fourth proportional to 80,352.64, 120,523.96 and 21,187 is: 31,779.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,352.64 : 120,523.96 = 21,187 : x
  2. Step 2: Convert to fraction form
    80,352.64/120,523.96 = 21,187/x
  3. Step 3: Cross multiply
    80,352.64x = 120,523.96 × 21,187
  4. Step 4: Simplify right side
    80,352.64x = 2,553,541,140.52
  5. Step 5: Solve for x
    x = 2,553,541,140.52/80,352.64
  6. Step 6: Final answer
    x = 31,779.18

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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.