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Finding the Fourth Proportional to 3,113.73, 4,669.11 and 921.87

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Solution

The fourth proportional to 3,113.73, 4,669.11 and 921.87 is: 1,382.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,113.73 : 4,669.11 = 921.87 : x
  2. Step 2: Convert to fraction form
    3,113.73/4,669.11 = 921.87/x
  3. Step 3: Cross multiply
    3,113.73x = 4,669.11 × 921.87
  4. Step 4: Simplify right side
    3,113.73x = 4,304,312.44
  5. Step 5: Solve for x
    x = 4,304,312.44/3,113.73
  6. Step 6: Final answer
    x = 1,382.37

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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.