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Finding the Fourth Proportional to 72,618.54, 100,213.65 and 40,789.50

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Solution

The fourth proportional to 72,618.54, 100,213.65 and 40,789.50 is: 56,289.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,618.54 : 100,213.65 = 40,789.50 : x
  2. Step 2: Convert to fraction form
    72,618.54/100,213.65 = 40,789.50/x
  3. Step 3: Cross multiply
    72,618.54x = 100,213.65 × 40,789.50
  4. Step 4: Simplify right side
    72,618.54x = 4,087,664,676.68
  5. Step 5: Solve for x
    x = 4,087,664,676.68/72,618.54
  6. Step 6: Final answer
    x = 56,289.55

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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.