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Finding the Fourth Proportional to 371.10, 556.70 and 140.28

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Solution

The fourth proportional to 371.10, 556.70 and 140.28 is: 210.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.10 : 556.70 = 140.28 : x
  2. Step 2: Convert to fraction form
    371.10/556.70 = 140.28/x
  3. Step 3: Cross multiply
    371.10x = 556.70 × 140.28
  4. Step 4: Simplify right side
    371.10x = 78,093.17
  5. Step 5: Solve for x
    x = 78,093.17/371.10
  6. Step 6: Final answer
    x = 210.44

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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.