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Finding the Fourth Proportional to 371.96, 557.50 and 128.20

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Solution

The fourth proportional to 371.96, 557.50 and 128.20 is: 192.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.96 : 557.50 = 128.20 : x
  2. Step 2: Convert to fraction form
    371.96/557.50 = 128.20/x
  3. Step 3: Cross multiply
    371.96x = 557.50 × 128.20
  4. Step 4: Simplify right side
    371.96x = 71,471.50
  5. Step 5: Solve for x
    x = 71,471.50/371.96
  6. Step 6: Final answer
    x = 192.15

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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.