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Finding the Fourth Proportional to 443,430.20, 665,145.30 and 436,431.80

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Solution

The fourth proportional to 443,430.20, 665,145.30 and 436,431.80 is: 654,647.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,430.20 : 665,145.30 = 436,431.80 : x
  2. Step 2: Convert to fraction form
    443,430.20/665,145.30 = 436,431.80/x
  3. Step 3: Cross multiply
    443,430.20x = 665,145.30 × 436,431.80
  4. Step 4: Simplify right side
    443,430.20x = 290,290,560,540.54
  5. Step 5: Solve for x
    x = 290,290,560,540.54/443,430.20
  6. Step 6: Final answer
    x = 654,647.70

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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.