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Finding the Fourth Proportional to 639,709.80, 959,127.30 and 302,911.80

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Solution

The fourth proportional to 639,709.80, 959,127.30 and 302,911.80 is: 454,160.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,709.80 : 959,127.30 = 302,911.80 : x
  2. Step 2: Convert to fraction form
    639,709.80/959,127.30 = 302,911.80/x
  3. Step 3: Cross multiply
    639,709.80x = 959,127.30 × 302,911.80
  4. Step 4: Simplify right side
    639,709.80x = 290,530,976,872.14
  5. Step 5: Solve for x
    x = 290,530,976,872.14/639,709.80
  6. Step 6: Final answer
    x = 454,160.58

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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.