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Finding the Fourth Proportional to 443,790.40, 665,248.20 and 218,966.80

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Solution

The fourth proportional to 443,790.40, 665,248.20 and 218,966.80 is: 328,234.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,790.40 : 665,248.20 = 218,966.80 : x
  2. Step 2: Convert to fraction form
    443,790.40/665,248.20 = 218,966.80/x
  3. Step 3: Cross multiply
    443,790.40x = 665,248.20 × 218,966.80
  4. Step 4: Simplify right side
    443,790.40x = 145,667,269,559.76
  5. Step 5: Solve for x
    x = 145,667,269,559.76/443,790.40
  6. Step 6: Final answer
    x = 328,234.39

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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.