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Finding the Fourth Proportional to 667,747.65, 921,810.87 and 381,212.31

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Solution

The fourth proportional to 667,747.65, 921,810.87 and 381,212.31 is: 526,255.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,747.65 : 921,810.87 = 381,212.31 : x
  2. Step 2: Convert to fraction form
    667,747.65/921,810.87 = 381,212.31/x
  3. Step 3: Cross multiply
    667,747.65x = 921,810.87 × 381,212.31
  4. Step 4: Simplify right side
    667,747.65x = 351,405,651,135.81
  5. Step 5: Solve for x
    x = 351,405,651,135.81/667,747.65
  6. Step 6: Final answer
    x = 526,255.17

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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.