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Finding the Fourth Proportional to 371.40, 557.21 and 140.31

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Solution

The fourth proportional to 371.40, 557.21 and 140.31 is: 210.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.40 : 557.21 = 140.31 : x
  2. Step 2: Convert to fraction form
    371.40/557.21 = 140.31/x
  3. Step 3: Cross multiply
    371.40x = 557.21 × 140.31
  4. Step 4: Simplify right side
    371.40x = 78,181.43
  5. Step 5: Solve for x
    x = 78,181.43/371.40
  6. Step 6: Final answer
    x = 210.50

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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.