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Finding the Fourth Proportional to 3,109.66, 4,664.75 and 918.48

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Solution

The fourth proportional to 3,109.66, 4,664.75 and 918.48 is: 1,377.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.66 : 4,664.75 = 918.48 : x
  2. Step 2: Convert to fraction form
    3,109.66/4,664.75 = 918.48/x
  3. Step 3: Cross multiply
    3,109.66x = 4,664.75 × 918.48
  4. Step 4: Simplify right side
    3,109.66x = 4,284,491.48
  5. Step 5: Solve for x
    x = 4,284,491.48/3,109.66
  6. Step 6: Final answer
    x = 1,377.80

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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.