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Finding the Fourth Proportional to 371.90, 557.70 and 128.36

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Solution

The fourth proportional to 371.90, 557.70 and 128.36 is: 192.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.90 : 557.70 = 128.36 : x
  2. Step 2: Convert to fraction form
    371.90/557.70 = 128.36/x
  3. Step 3: Cross multiply
    371.90x = 557.70 × 128.36
  4. Step 4: Simplify right side
    371.90x = 71,586.37
  5. Step 5: Solve for x
    x = 71,586.37/371.90
  6. Step 6: Final answer
    x = 192.49

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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.