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Finding the Fourth Proportional to 139,971.40, 209,893.90 and 40,108.76

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Solution

The fourth proportional to 139,971.40, 209,893.90 and 40,108.76 is: 60,145.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,971.40 : 209,893.90 = 40,108.76 : x
  2. Step 2: Convert to fraction form
    139,971.40/209,893.90 = 40,108.76/x
  3. Step 3: Cross multiply
    139,971.40x = 209,893.90 × 40,108.76
  4. Step 4: Simplify right side
    139,971.40x = 8,418,584,060.56
  5. Step 5: Solve for x
    x = 8,418,584,060.56/139,971.40
  6. Step 6: Final answer
    x = 60,145.03

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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.