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Finding the Fourth Proportional to 778,978.80, 1,168,468.20 and 280,162.80

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Solution

The fourth proportional to 778,978.80, 1,168,468.20 and 280,162.80 is: 420,244.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    778,978.80 : 1,168,468.20 = 280,162.80 : x
  2. Step 2: Convert to fraction form
    778,978.80/1,168,468.20 = 280,162.80/x
  3. Step 3: Cross multiply
    778,978.80x = 1,168,468.20 × 280,162.80
  4. Step 4: Simplify right side
    778,978.80x = 327,361,322,622.96
  5. Step 5: Solve for x
    x = 327,361,322,622.96/778,978.80
  6. Step 6: Final answer
    x = 420,244.20

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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.