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Finding the Fourth Proportional to 445,818.60, 668,727.90 and 421,324.20

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Solution

The fourth proportional to 445,818.60, 668,727.90 and 421,324.20 is: 631,986.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,818.60 : 668,727.90 = 421,324.20 : x
  2. Step 2: Convert to fraction form
    445,818.60/668,727.90 = 421,324.20/x
  3. Step 3: Cross multiply
    445,818.60x = 668,727.90 × 421,324.20
  4. Step 4: Simplify right side
    445,818.60x = 281,751,247,485.18
  5. Step 5: Solve for x
    x = 281,751,247,485.18/445,818.60
  6. Step 6: Final answer
    x = 631,986.30

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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.