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Finding the Fourth Proportional to 485,611.20, 728,416.80 and 408,628.80

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Solution

The fourth proportional to 485,611.20, 728,416.80 and 408,628.80 is: 612,943.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,611.20 : 728,416.80 = 408,628.80 : x
  2. Step 2: Convert to fraction form
    485,611.20/728,416.80 = 408,628.80/x
  3. Step 3: Cross multiply
    485,611.20x = 728,416.80 × 408,628.80
  4. Step 4: Simplify right side
    485,611.20x = 297,652,082,883.84
  5. Step 5: Solve for x
    x = 297,652,082,883.84/485,611.20
  6. Step 6: Final answer
    x = 612,943.20

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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.