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Finding the Fourth Proportional to 80,520.50, 120,771.51 and 21,360.78

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Solution

The fourth proportional to 80,520.50, 120,771.51 and 21,360.78 is: 32,038.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,520.50 : 120,771.51 = 21,360.78 : x
  2. Step 2: Convert to fraction form
    80,520.50/120,771.51 = 21,360.78/x
  3. Step 3: Cross multiply
    80,520.50x = 120,771.51 × 21,360.78
  4. Step 4: Simplify right side
    80,520.50x = 2,579,773,695.43
  5. Step 5: Solve for x
    x = 2,579,773,695.43/80,520.50
  6. Step 6: Final answer
    x = 32,038.72

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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.