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Finding the Fourth Proportional to 392,486.40, 587,563.20 and 345,830.40

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Solution

The fourth proportional to 392,486.40, 587,563.20 and 345,830.40 is: 517,717.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,486.40 : 587,563.20 = 345,830.40 : x
  2. Step 2: Convert to fraction form
    392,486.40/587,563.20 = 345,830.40/x
  3. Step 3: Cross multiply
    392,486.40x = 587,563.20 × 345,830.40
  4. Step 4: Simplify right side
    392,486.40x = 203,197,216,481.28
  5. Step 5: Solve for x
    x = 203,197,216,481.28/392,486.40
  6. Step 6: Final answer
    x = 517,717.85

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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.