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Finding the Fourth Proportional to 667,679.86, 921,717.53 and 381,144.59

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Solution

The fourth proportional to 667,679.86, 921,717.53 and 381,144.59 is: 526,161.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,679.86 : 921,717.53 = 381,144.59 : x
  2. Step 2: Convert to fraction form
    667,679.86/921,717.53 = 381,144.59/x
  3. Step 3: Cross multiply
    667,679.86x = 921,717.53 × 381,144.59
  4. Step 4: Simplify right side
    667,679.86x = 351,307,648,439.09
  5. Step 5: Solve for x
    x = 351,307,648,439.09/667,679.86
  6. Step 6: Final answer
    x = 526,161.82

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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.