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Finding the Fourth Proportional to 485,738.20, 728,607.30 and 275,786.20

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Solution

The fourth proportional to 485,738.20, 728,607.30 and 275,786.20 is: 413,679.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,738.20 : 728,607.30 = 275,786.20 : x
  2. Step 2: Convert to fraction form
    485,738.20/728,607.30 = 275,786.20/x
  3. Step 3: Cross multiply
    485,738.20x = 728,607.30 × 275,786.20
  4. Step 4: Simplify right side
    485,738.20x = 200,939,838,559.26
  5. Step 5: Solve for x
    x = 200,939,838,559.26/485,738.20
  6. Step 6: Final answer
    x = 413,679.30

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Double scale
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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.