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Finding the Fourth Proportional to 515,448.80, 711,354.86 and 289,108.88

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Solution

The fourth proportional to 515,448.80, 711,354.86 and 289,108.88 is: 398,990.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,448.80 : 711,354.86 = 289,108.88 : x
  2. Step 2: Convert to fraction form
    515,448.80/711,354.86 = 289,108.88/x
  3. Step 3: Cross multiply
    515,448.80x = 711,354.86 × 289,108.88
  4. Step 4: Simplify right side
    515,448.80x = 205,659,001,854.84
  5. Step 5: Solve for x
    x = 205,659,001,854.84/515,448.80
  6. Step 6: Final answer
    x = 398,990.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.