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Finding the Fourth Proportional to 140,376.88, 210,711.12 and 81,327.88

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Solution

The fourth proportional to 140,376.88, 210,711.12 and 81,327.88 is: 122,076.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,376.88 : 210,711.12 = 81,327.88 : x
  2. Step 2: Convert to fraction form
    140,376.88/210,711.12 = 81,327.88/x
  3. Step 3: Cross multiply
    140,376.88x = 210,711.12 × 81,327.88
  4. Step 4: Simplify right side
    140,376.88x = 17,136,688,682.03
  5. Step 5: Solve for x
    x = 17,136,688,682.03/140,376.88
  6. Step 6: Final answer
    x = 122,076.29

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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.