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Finding the Fourth Proportional to 323,915.80, 485,873.70 and 280,613.20

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Solution

The fourth proportional to 323,915.80, 485,873.70 and 280,613.20 is: 420,919.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,915.80 : 485,873.70 = 280,613.20 : x
  2. Step 2: Convert to fraction form
    323,915.80/485,873.70 = 280,613.20/x
  3. Step 3: Cross multiply
    323,915.80x = 485,873.70 × 280,613.20
  4. Step 4: Simplify right side
    323,915.80x = 136,342,573,752.84
  5. Step 5: Solve for x
    x = 136,342,573,752.84/323,915.80
  6. Step 6: Final answer
    x = 420,919.80

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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.