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Finding the Fourth Proportional to 667,809.65, 921,896.52 and 381,274.40

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Solution

The fourth proportional to 667,809.65, 921,896.52 and 381,274.40 is: 526,340.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,809.65 : 921,896.52 = 381,274.40 : x
  2. Step 2: Convert to fraction form
    667,809.65/921,896.52 = 381,274.40/x
  3. Step 3: Cross multiply
    667,809.65x = 921,896.52 × 381,274.40
  4. Step 4: Simplify right side
    667,809.65x = 351,495,542,525.09
  5. Step 5: Solve for x
    x = 351,495,542,525.09/667,809.65
  6. Step 6: Final answer
    x = 526,340.92

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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.