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Finding the Fourth Proportional to 91,481.40, 137,222.10 and 85,260.60

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Solution

The fourth proportional to 91,481.40, 137,222.10 and 85,260.60 is: 127,890.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,481.40 : 137,222.10 = 85,260.60 : x
  2. Step 2: Convert to fraction form
    91,481.40/137,222.10 = 85,260.60/x
  3. Step 3: Cross multiply
    91,481.40x = 137,222.10 × 85,260.60
  4. Step 4: Simplify right side
    91,481.40x = 11,699,638,579.26
  5. Step 5: Solve for x
    x = 11,699,638,579.26/91,481.40
  6. Step 6: Final answer
    x = 127,890.90

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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.