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Finding the Fourth Proportional to 921,636, 1,382,998.32 and 389,122.56

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Solution

The fourth proportional to 921,636, 1,382,998.32 and 389,122.56 is: 583,913.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    921,636 : 1,382,998.32 = 389,122.56 : x
  2. Step 2: Convert to fraction form
    921,636/1,382,998.32 = 389,122.56/x
  3. Step 3: Cross multiply
    921,636x = 1,382,998.32 × 389,122.56
  4. Step 4: Simplify right side
    921,636x = 538,155,846,754.10
  5. Step 5: Solve for x
    x = 538,155,846,754.10/921,636
  6. Step 6: Final answer
    x = 583,913.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.