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Finding the Fourth Proportional to 391,505.60, 587,258.40 and 125,274.80

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Solution

The fourth proportional to 391,505.60, 587,258.40 and 125,274.80 is: 187,912.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,505.60 : 587,258.40 = 125,274.80 : x
  2. Step 2: Convert to fraction form
    391,505.60/587,258.40 = 125,274.80/x
  3. Step 3: Cross multiply
    391,505.60x = 587,258.40 × 125,274.80
  4. Step 4: Simplify right side
    391,505.60x = 73,568,678,608.32
  5. Step 5: Solve for x
    x = 73,568,678,608.32/391,505.60
  6. Step 6: Final answer
    x = 187,912.20

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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.