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Finding the Fourth Proportional to 443,635.20, 665,452.80 and 128,102.40

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Solution

The fourth proportional to 443,635.20, 665,452.80 and 128,102.40 is: 192,153.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,635.20 : 665,452.80 = 128,102.40 : x
  2. Step 2: Convert to fraction form
    443,635.20/665,452.80 = 128,102.40/x
  3. Step 3: Cross multiply
    443,635.20x = 665,452.80 × 128,102.40
  4. Step 4: Simplify right side
    443,635.20x = 85,246,100,766.72
  5. Step 5: Solve for x
    x = 85,246,100,766.72/443,635.20
  6. Step 6: Final answer
    x = 192,153.60

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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.