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Finding the Fourth Proportional to 91,738.40, 137,607.60 and 82,115.60

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Solution

The fourth proportional to 91,738.40, 137,607.60 and 82,115.60 is: 123,173.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,738.40 : 137,607.60 = 82,115.60 : x
  2. Step 2: Convert to fraction form
    91,738.40/137,607.60 = 82,115.60/x
  3. Step 3: Cross multiply
    91,738.40x = 137,607.60 × 82,115.60
  4. Step 4: Simplify right side
    91,738.40x = 11,299,730,638.56
  5. Step 5: Solve for x
    x = 11,299,730,638.56/91,738.40
  6. Step 6: Final answer
    x = 123,173.40

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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.