Home / 445,820.60-668,730.90-421,326.20

Finding the Fourth Proportional to 445,820.60, 668,730.90 and 421,326.20

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Solution

The fourth proportional to 445,820.60, 668,730.90 and 421,326.20 is: 631,989.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,820.60 : 668,730.90 = 421,326.20 : x
  2. Step 2: Convert to fraction form
    445,820.60/668,730.90 = 421,326.20/x
  3. Step 3: Cross multiply
    445,820.60x = 668,730.90 × 421,326.20
  4. Step 4: Simplify right side
    445,820.60x = 281,753,848,919.58
  5. Step 5: Solve for x
    x = 281,753,848,919.58/445,820.60
  6. Step 6: Final answer
    x = 631,989.30

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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.