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Finding the Fourth Proportional to 391,251.20, 587,107.20 and 141,958.40

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Solution

The fourth proportional to 391,251.20, 587,107.20 and 141,958.40 is: 213,021.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,251.20 : 587,107.20 = 141,958.40 : x
  2. Step 2: Convert to fraction form
    391,251.20/587,107.20 = 141,958.40/x
  3. Step 3: Cross multiply
    391,251.20x = 587,107.20 × 141,958.40
  4. Step 4: Simplify right side
    391,251.20x = 83,344,798,740.48
  5. Step 5: Solve for x
    x = 83,344,798,740.48/391,251.20
  6. Step 6: Final answer
    x = 213,021.20

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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.