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Finding the Fourth Proportional to 391,486.40, 587,229.60 and 359,993.60

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Solution

The fourth proportional to 391,486.40, 587,229.60 and 359,993.60 is: 539,990.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,486.40 : 587,229.60 = 359,993.60 : x
  2. Step 2: Convert to fraction form
    391,486.40/587,229.60 = 359,993.60/x
  3. Step 3: Cross multiply
    391,486.40x = 587,229.60 × 359,993.60
  4. Step 4: Simplify right side
    391,486.40x = 211,398,897,730.56
  5. Step 5: Solve for x
    x = 211,398,897,730.56/391,486.40
  6. Step 6: Final answer
    x = 539,990.40

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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.