Home / 138,138.20-206,420.93-103,719.57

Finding the Fourth Proportional to 138,138.20, 206,420.93 and 103,719.57

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Solution

The fourth proportional to 138,138.20, 206,420.93 and 103,719.57 is: 154,988.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,138.20 : 206,420.93 = 103,719.57 : x
  2. Step 2: Convert to fraction form
    138,138.20/206,420.93 = 103,719.57/x
  3. Step 3: Cross multiply
    138,138.20x = 206,420.93 × 103,719.57
  4. Step 4: Simplify right side
    138,138.20x = 21,409,889,580.00
  5. Step 5: Solve for x
    x = 21,409,889,580.00/138,138.20
  6. Step 6: Final answer
    x = 154,988.92

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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.