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Finding the Fourth Proportional to 443,634.80, 665,452.20 and 128,123.60

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Solution

The fourth proportional to 443,634.80, 665,452.20 and 128,123.60 is: 192,185.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,634.80 : 665,452.20 = 128,123.60 : x
  2. Step 2: Convert to fraction form
    443,634.80/665,452.20 = 128,123.60/x
  3. Step 3: Cross multiply
    443,634.80x = 665,452.20 × 128,123.60
  4. Step 4: Simplify right side
    443,634.80x = 85,260,131,491.92
  5. Step 5: Solve for x
    x = 85,260,131,491.92/443,634.80
  6. Step 6: Final answer
    x = 192,185.40

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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.