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Finding the Fourth Proportional to 84,611.94, 126,918.21 and 21,432.03

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Solution

The fourth proportional to 84,611.94, 126,918.21 and 21,432.03 is: 32,148.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,611.94 : 126,918.21 = 21,432.03 : x
  2. Step 2: Convert to fraction form
    84,611.94/126,918.21 = 21,432.03/x
  3. Step 3: Cross multiply
    84,611.94x = 126,918.21 × 21,432.03
  4. Step 4: Simplify right side
    84,611.94x = 2,720,114,884.27
  5. Step 5: Solve for x
    x = 2,720,114,884.27/84,611.94
  6. Step 6: Final answer
    x = 32,148.12

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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.