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Finding the Fourth Proportional to 80,326.40, 120,489.60 and 21,171.20

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Solution

The fourth proportional to 80,326.40, 120,489.60 and 21,171.20 is: 31,756.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,326.40 : 120,489.60 = 21,171.20 : x
  2. Step 2: Convert to fraction form
    80,326.40/120,489.60 = 21,171.20/x
  3. Step 3: Cross multiply
    80,326.40x = 120,489.60 × 21,171.20
  4. Step 4: Simplify right side
    80,326.40x = 2,550,909,419.52
  5. Step 5: Solve for x
    x = 2,550,909,419.52/80,326.40
  6. Step 6: Final answer
    x = 31,756.80

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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.