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Finding the Fourth Proportional to 443,615.70, 665,423.55 and 128,082.90

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Solution

The fourth proportional to 443,615.70, 665,423.55 and 128,082.90 is: 192,124.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,615.70 : 665,423.55 = 128,082.90 : x
  2. Step 2: Convert to fraction form
    443,615.70/665,423.55 = 128,082.90/x
  3. Step 3: Cross multiply
    443,615.70x = 665,423.55 × 128,082.90
  4. Step 4: Simplify right side
    443,615.70x = 85,229,378,012.30
  5. Step 5: Solve for x
    x = 85,229,378,012.30/443,615.70
  6. Step 6: Final answer
    x = 192,124.35

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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.