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Finding the Fourth Proportional to 667,998.57, 921,936.51 and 423,005.69

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Solution

The fourth proportional to 667,998.57, 921,936.51 and 423,005.69 is: 583,810.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,998.57 : 921,936.51 = 423,005.69 : x
  2. Step 2: Convert to fraction form
    667,998.57/921,936.51 = 423,005.69/x
  3. Step 3: Cross multiply
    667,998.57x = 921,936.51 × 423,005.69
  4. Step 4: Simplify right side
    667,998.57x = 389,984,384,939.06
  5. Step 5: Solve for x
    x = 389,984,384,939.06/667,998.57
  6. Step 6: Final answer
    x = 583,810.21

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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.