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Finding the Fourth Proportional to 391,995.20, 587,992.80 and 389,230.40

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Solution

The fourth proportional to 391,995.20, 587,992.80 and 389,230.40 is: 583,845.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,995.20 : 587,992.80 = 389,230.40 : x
  2. Step 2: Convert to fraction form
    391,995.20/587,992.80 = 389,230.40/x
  3. Step 3: Cross multiply
    391,995.20x = 587,992.80 × 389,230.40
  4. Step 4: Simplify right side
    391,995.20x = 228,864,672,741.12
  5. Step 5: Solve for x
    x = 228,864,672,741.12/391,995.20
  6. Step 6: Final answer
    x = 583,845.60

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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.