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Finding the Fourth Proportional to 3,109.88, 4,664.82 and 918.57

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Solution

The fourth proportional to 3,109.88, 4,664.82 and 918.57 is: 1,377.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.88 : 4,664.82 = 918.57 : x
  2. Step 2: Convert to fraction form
    3,109.88/4,664.82 = 918.57/x
  3. Step 3: Cross multiply
    3,109.88x = 4,664.82 × 918.57
  4. Step 4: Simplify right side
    3,109.88x = 4,284,963.71
  5. Step 5: Solve for x
    x = 4,284,963.71/3,109.88
  6. Step 6: Final answer
    x = 1,377.86

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Similar ratio
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1.5x scale

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.