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Finding the Fourth Proportional to 81,409.35, 122,127.89 and 28,086.87

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Solution

The fourth proportional to 81,409.35, 122,127.89 and 28,086.87 is: 42,135.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,409.35 : 122,127.89 = 28,086.87 : x
  2. Step 2: Convert to fraction form
    81,409.35/122,127.89 = 28,086.87/x
  3. Step 3: Cross multiply
    81,409.35x = 122,127.89 × 28,086.87
  4. Step 4: Simplify right side
    81,409.35x = 3,430,190,487.35
  5. Step 5: Solve for x
    x = 3,430,190,487.35/81,409.35
  6. Step 6: Final answer
    x = 42,135.09

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1.5x scale

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.