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Finding the Fourth Proportional to 80,720.45, 121,079.45 and 36,315.84

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Solution

The fourth proportional to 80,720.45, 121,079.45 and 36,315.84 is: 54,473.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,720.45 : 121,079.45 = 36,315.84 : x
  2. Step 2: Convert to fraction form
    80,720.45/121,079.45 = 36,315.84/x
  3. Step 3: Cross multiply
    80,720.45x = 121,079.45 × 36,315.84
  4. Step 4: Simplify right side
    80,720.45x = 4,397,102,024.28
  5. Step 5: Solve for x
    x = 4,397,102,024.28/80,720.45
  6. Step 6: Final answer
    x = 54,473.21

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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.