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Finding the Fourth Proportional to 81,878.40, 122,817.60 and 40,316.80

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Solution

The fourth proportional to 81,878.40, 122,817.60 and 40,316.80 is: 60,475.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,878.40 : 122,817.60 = 40,316.80 : x
  2. Step 2: Convert to fraction form
    81,878.40/122,817.60 = 40,316.80/x
  3. Step 3: Cross multiply
    81,878.40x = 122,817.60 × 40,316.80
  4. Step 4: Simplify right side
    81,878.40x = 4,951,612,615.68
  5. Step 5: Solve for x
    x = 4,951,612,615.68/81,878.40
  6. Step 6: Final answer
    x = 60,475.20

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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.