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Finding the Fourth Proportional to 518,682.80, 778,024.20 and 323,991.20

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Solution

The fourth proportional to 518,682.80, 778,024.20 and 323,991.20 is: 485,986.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,682.80 : 778,024.20 = 323,991.20 : x
  2. Step 2: Convert to fraction form
    518,682.80/778,024.20 = 323,991.20/x
  3. Step 3: Cross multiply
    518,682.80x = 778,024.20 × 323,991.20
  4. Step 4: Simplify right side
    518,682.80x = 252,072,994,187.04
  5. Step 5: Solve for x
    x = 252,072,994,187.04/518,682.80
  6. Step 6: Final answer
    x = 485,986.80

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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.