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Finding the Fourth Proportional to 140,212.80, 210,537.90 and 81,163.80

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Solution

The fourth proportional to 140,212.80, 210,537.90 and 81,163.80 is: 121,872.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,212.80 : 210,537.90 = 81,163.80 : x
  2. Step 2: Convert to fraction form
    140,212.80/210,537.90 = 81,163.80/x
  3. Step 3: Cross multiply
    140,212.80x = 210,537.90 × 81,163.80
  4. Step 4: Simplify right side
    140,212.80x = 17,088,056,008.02
  5. Step 5: Solve for x
    x = 17,088,056,008.02/140,212.80
  6. Step 6: Final answer
    x = 121,872.30

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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.