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Finding the Fourth Proportional to 667,750.65, 921,815.01 and 381,215.31

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Solution

The fourth proportional to 667,750.65, 921,815.01 and 381,215.31 is: 526,259.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,750.65 : 921,815.01 = 381,215.31 : x
  2. Step 2: Convert to fraction form
    667,750.65/921,815.01 = 381,215.31/x
  3. Step 3: Cross multiply
    667,750.65x = 921,815.01 × 381,215.31
  4. Step 4: Simplify right side
    667,750.65x = 351,409,994,799.80
  5. Step 5: Solve for x
    x = 351,409,994,799.80/667,750.65
  6. Step 6: Final answer
    x = 526,259.31

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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.