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Finding the Fourth Proportional to 443,053.80, 664,580.70 and 206,420.40

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Solution

The fourth proportional to 443,053.80, 664,580.70 and 206,420.40 is: 309,630.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,053.80 : 664,580.70 = 206,420.40 : x
  2. Step 2: Convert to fraction form
    443,053.80/664,580.70 = 206,420.40/x
  3. Step 3: Cross multiply
    443,053.80x = 664,580.70 × 206,420.40
  4. Step 4: Simplify right side
    443,053.80x = 137,183,013,926.28
  5. Step 5: Solve for x
    x = 137,183,013,926.28/443,053.80
  6. Step 6: Final answer
    x = 309,630.60

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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.