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Finding the Fourth Proportional to 90,450, 124,821 and 55,122

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Solution

The fourth proportional to 90,450, 124,821 and 55,122 is: 76,068.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,450 : 124,821 = 55,122 : x
  2. Step 2: Convert to fraction form
    90,450/124,821 = 55,122/x
  3. Step 3: Cross multiply
    90,450x = 124,821 × 55,122
  4. Step 4: Simplify right side
    90,450x = 6,880,383,162
  5. Step 5: Solve for x
    x = 6,880,383,162/90,450
  6. Step 6: Final answer
    x = 76,068.36

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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.