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Finding the Fourth Proportional to 85,324.40, 127,986.60 and 81,868.40

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Solution

The fourth proportional to 85,324.40, 127,986.60 and 81,868.40 is: 122,802.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,324.40 : 127,986.60 = 81,868.40 : x
  2. Step 2: Convert to fraction form
    85,324.40/127,986.60 = 81,868.40/x
  3. Step 3: Cross multiply
    85,324.40x = 127,986.60 × 81,868.40
  4. Step 4: Simplify right side
    85,324.40x = 10,478,058,163.44
  5. Step 5: Solve for x
    x = 10,478,058,163.44/85,324.40
  6. Step 6: Final answer
    x = 122,802.60

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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.