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Finding the Fourth Proportional to 138,015.40, 206,504.70 and 125,573.80

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Solution

The fourth proportional to 138,015.40, 206,504.70 and 125,573.80 is: 187,889.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,015.40 : 206,504.70 = 125,573.80 : x
  2. Step 2: Convert to fraction form
    138,015.40/206,504.70 = 125,573.80/x
  3. Step 3: Cross multiply
    138,015.40x = 206,504.70 × 125,573.80
  4. Step 4: Simplify right side
    138,015.40x = 25,931,579,896.86
  5. Step 5: Solve for x
    x = 25,931,579,896.86/138,015.40
  6. Step 6: Final answer
    x = 187,889.03

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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.