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Finding the Fourth Proportional to 371.87, 557.74 and 140.70

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Solution

The fourth proportional to 371.87, 557.74 and 140.70 is: 211.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.87 : 557.74 = 140.70 : x
  2. Step 2: Convert to fraction form
    371.87/557.74 = 140.70/x
  3. Step 3: Cross multiply
    371.87x = 557.74 × 140.70
  4. Step 4: Simplify right side
    371.87x = 78,474.02
  5. Step 5: Solve for x
    x = 78,474.02/371.87
  6. Step 6: Final answer
    x = 211.03

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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.