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Finding the Fourth Proportional to 80,483.80, 120,720.30 and 21,318.20

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Solution

The fourth proportional to 80,483.80, 120,720.30 and 21,318.20 is: 31,975.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,483.80 : 120,720.30 = 21,318.20 : x
  2. Step 2: Convert to fraction form
    80,483.80/120,720.30 = 21,318.20/x
  3. Step 3: Cross multiply
    80,483.80x = 120,720.30 × 21,318.20
  4. Step 4: Simplify right side
    80,483.80x = 2,573,539,499.46
  5. Step 5: Solve for x
    x = 2,573,539,499.46/80,483.80
  6. Step 6: Final answer
    x = 31,975.87

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1.5x scale

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.