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Finding the Fourth Proportional to 391,999,845.86, 588,088,353.51 and 129,683,781.62

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Solution

The fourth proportional to 391,999,845.86, 588,088,353.51 and 129,683,781.62 is: 194,554,978.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,999,845.86 : 588,088,353.51 = 129,683,781.62 : x
  2. Step 2: Convert to fraction form
    391,999,845.86/588,088,353.51 = 129,683,781.62/x
  3. Step 3: Cross multiply
    391,999,845.86x = 588,088,353.51 × 129,683,781.62
  4. Step 4: Simplify right side
    391,999,845.86x = 76,265,521,609,856,208
  5. Step 5: Solve for x
    x = 76,265,521,609,856,208/391,999,845.86
  6. Step 6: Final answer
    x = 194,554,978.57

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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.