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Finding the Fourth Proportional to 84,241.50, 126,369.54 and 21,912

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Solution

The fourth proportional to 84,241.50, 126,369.54 and 21,912 is: 32,869.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,241.50 : 126,369.54 = 21,912 : x
  2. Step 2: Convert to fraction form
    84,241.50/126,369.54 = 21,912/x
  3. Step 3: Cross multiply
    84,241.50x = 126,369.54 × 21,912
  4. Step 4: Simplify right side
    84,241.50x = 2,769,009,360.48
  5. Step 5: Solve for x
    x = 2,769,009,360.48/84,241.50
  6. Step 6: Final answer
    x = 32,869.90

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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.