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Finding the Fourth Proportional to 3,109.28, 4,664.82 and 918.02

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Solution

The fourth proportional to 3,109.28, 4,664.82 and 918.02 is: 1,377.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.28 : 4,664.82 = 918.02 : x
  2. Step 2: Convert to fraction form
    3,109.28/4,664.82 = 918.02/x
  3. Step 3: Cross multiply
    3,109.28x = 4,664.82 × 918.02
  4. Step 4: Simplify right side
    3,109.28x = 4,282,374.73
  5. Step 5: Solve for x
    x = 4,282,374.73/3,109.28
  6. Step 6: Final answer
    x = 1,377.29

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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.