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Finding the Fourth Proportional to 140,548.60, 210,858.90 and 81,278.20

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Solution

The fourth proportional to 140,548.60, 210,858.90 and 81,278.20 is: 121,938.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,548.60 : 210,858.90 = 81,278.20 : x
  2. Step 2: Convert to fraction form
    140,548.60/210,858.90 = 81,278.20/x
  3. Step 3: Cross multiply
    140,548.60x = 210,858.90 × 81,278.20
  4. Step 4: Simplify right side
    140,548.60x = 17,138,231,845.98
  5. Step 5: Solve for x
    x = 17,138,231,845.98/140,548.60
  6. Step 6: Final answer
    x = 121,938.12

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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.