Home / 138,139.11-206,422.31-103,720.50

Finding the Fourth Proportional to 138,139.11, 206,422.31 and 103,720.50

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Solution

The fourth proportional to 138,139.11, 206,422.31 and 103,720.50 is: 154,990.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,139.11 : 206,422.31 = 103,720.50 : x
  2. Step 2: Convert to fraction form
    138,139.11/206,422.31 = 103,720.50/x
  3. Step 3: Cross multiply
    138,139.11x = 206,422.31 × 103,720.50
  4. Step 4: Simplify right side
    138,139.11x = 21,410,224,685.75
  5. Step 5: Solve for x
    x = 21,410,224,685.75/138,139.11
  6. Step 6: Final answer
    x = 154,990.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.