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Finding the Fourth Proportional to 665,891.10, 998,909.55 and 644,895.90

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Solution

The fourth proportional to 665,891.10, 998,909.55 and 644,895.90 is: 967,414.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,891.10 : 998,909.55 = 644,895.90 : x
  2. Step 2: Convert to fraction form
    665,891.10/998,909.55 = 644,895.90/x
  3. Step 3: Cross multiply
    665,891.10x = 998,909.55 × 644,895.90
  4. Step 4: Simplify right side
    665,891.10x = 644,192,673,265.85
  5. Step 5: Solve for x
    x = 644,192,673,265.85/665,891.10
  6. Step 6: Final answer
    x = 967,414.45

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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.