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Finding the Fourth Proportional to 81,880.40, 122,820.60 and 40,318.80

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Solution

The fourth proportional to 81,880.40, 122,820.60 and 40,318.80 is: 60,478.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,880.40 : 122,820.60 = 40,318.80 : x
  2. Step 2: Convert to fraction form
    81,880.40/122,820.60 = 40,318.80/x
  3. Step 3: Cross multiply
    81,880.40x = 122,820.60 × 40,318.80
  4. Step 4: Simplify right side
    81,880.40x = 4,951,979,207.28
  5. Step 5: Solve for x
    x = 4,951,979,207.28/81,880.40
  6. Step 6: Final answer
    x = 60,478.20

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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.