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Finding the Fourth Proportional to 81,356.50, 112,258.60 and 51,120.41

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Solution

The fourth proportional to 81,356.50, 112,258.60 and 51,120.41 is: 70,537.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,356.50 : 112,258.60 = 51,120.41 : x
  2. Step 2: Convert to fraction form
    81,356.50/112,258.60 = 51,120.41/x
  3. Step 3: Cross multiply
    81,356.50x = 112,258.60 × 51,120.41
  4. Step 4: Simplify right side
    81,356.50x = 5,738,704,968.93
  5. Step 5: Solve for x
    x = 5,738,704,968.93/81,356.50
  6. Step 6: Final answer
    x = 70,537.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.