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Finding the Fourth Proportional to 391,426.80, 587,140.20 and 324,999.60

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Solution

The fourth proportional to 391,426.80, 587,140.20 and 324,999.60 is: 487,499.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,426.80 : 587,140.20 = 324,999.60 : x
  2. Step 2: Convert to fraction form
    391,426.80/587,140.20 = 324,999.60/x
  3. Step 3: Cross multiply
    391,426.80x = 587,140.20 × 324,999.60
  4. Step 4: Simplify right side
    391,426.80x = 190,820,330,143.92
  5. Step 5: Solve for x
    x = 190,820,330,143.92/391,426.80
  6. Step 6: Final answer
    x = 487,499.40

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Similar ratio
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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.