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Finding the Fourth Proportional to 90,628, 125,074.32 and 50,891.68

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Solution

The fourth proportional to 90,628, 125,074.32 and 50,891.68 is: 70,234.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,628 : 125,074.32 = 50,891.68 : x
  2. Step 2: Convert to fraction form
    90,628/125,074.32 = 50,891.68/x
  3. Step 3: Cross multiply
    90,628x = 125,074.32 × 50,891.68
  4. Step 4: Simplify right side
    90,628x = 6,365,242,269.66
  5. Step 5: Solve for x
    x = 6,365,242,269.66/90,628
  6. Step 6: Final answer
    x = 70,234.83

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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.