Home / 138,958.20-191,761.50-78,548.40

Finding the Fourth Proportional to 138,958.20, 191,761.50 and 78,548.40

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Solution

The fourth proportional to 138,958.20, 191,761.50 and 78,548.40 is: 108,396.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,958.20 : 191,761.50 = 78,548.40 : x
  2. Step 2: Convert to fraction form
    138,958.20/191,761.50 = 78,548.40/x
  3. Step 3: Cross multiply
    138,958.20x = 191,761.50 × 78,548.40
  4. Step 4: Simplify right side
    138,958.20x = 15,062,559,006.60
  5. Step 5: Solve for x
    x = 15,062,559,006.60/138,958.20
  6. Step 6: Final answer
    x = 108,396.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.