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Finding the Fourth Proportional to 138,839.60, 208,259.40 and 50,106.80

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Solution

The fourth proportional to 138,839.60, 208,259.40 and 50,106.80 is: 75,160.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,839.60 : 208,259.40 = 50,106.80 : x
  2. Step 2: Convert to fraction form
    138,839.60/208,259.40 = 50,106.80/x
  3. Step 3: Cross multiply
    138,839.60x = 208,259.40 × 50,106.80
  4. Step 4: Simplify right side
    138,839.60x = 10,435,212,103.92
  5. Step 5: Solve for x
    x = 10,435,212,103.92/138,839.60
  6. Step 6: Final answer
    x = 75,160.20

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1.5x scale

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.