Home / 207,923.60-311,885.40-128,781.20

Finding the Fourth Proportional to 207,923.60, 311,885.40 and 128,781.20

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Solution

The fourth proportional to 207,923.60, 311,885.40 and 128,781.20 is: 193,171.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,923.60 : 311,885.40 = 128,781.20 : x
  2. Step 2: Convert to fraction form
    207,923.60/311,885.40 = 128,781.20/x
  3. Step 3: Cross multiply
    207,923.60x = 311,885.40 × 128,781.20
  4. Step 4: Simplify right side
    207,923.60x = 40,164,976,074.48
  5. Step 5: Solve for x
    x = 40,164,976,074.48/207,923.60
  6. Step 6: Final answer
    x = 193,171.80

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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.