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Finding the Fourth Proportional to 371.81, 557.55 and 140.65

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Solution

The fourth proportional to 371.81, 557.55 and 140.65 is: 210.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.81 : 557.55 = 140.65 : x
  2. Step 2: Convert to fraction form
    371.81/557.55 = 140.65/x
  3. Step 3: Cross multiply
    371.81x = 557.55 × 140.65
  4. Step 4: Simplify right side
    371.81x = 78,418.01
  5. Step 5: Solve for x
    x = 78,418.01/371.81
  6. Step 6: Final answer
    x = 210.91

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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.