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Finding the Fourth Proportional to 80,484.12, 120,720.51 and 21,318.48

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Solution

The fourth proportional to 80,484.12, 120,720.51 and 21,318.48 is: 31,976.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,484.12 : 120,720.51 = 21,318.48 : x
  2. Step 2: Convert to fraction form
    80,484.12/120,720.51 = 21,318.48/x
  3. Step 3: Cross multiply
    80,484.12x = 120,720.51 × 21,318.48
  4. Step 4: Simplify right side
    80,484.12x = 2,573,577,778.02
  5. Step 5: Solve for x
    x = 2,573,577,778.02/80,484.12
  6. Step 6: Final answer
    x = 31,976.22

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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.