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Finding the Fourth Proportional to 391,621.20, 587,431.80 and 371,403.60

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Solution

The fourth proportional to 391,621.20, 587,431.80 and 371,403.60 is: 557,105.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,621.20 : 587,431.80 = 371,403.60 : x
  2. Step 2: Convert to fraction form
    391,621.20/587,431.80 = 371,403.60/x
  3. Step 3: Cross multiply
    391,621.20x = 587,431.80 × 371,403.60
  4. Step 4: Simplify right side
    391,621.20x = 218,174,285,274.48
  5. Step 5: Solve for x
    x = 218,174,285,274.48/391,621.20
  6. Step 6: Final answer
    x = 557,105.40

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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.