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Finding the Fourth Proportional to 371.93, 558.12 and 128.63

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Solution

The fourth proportional to 371.93, 558.12 and 128.63 is: 193.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.93 : 558.12 = 128.63 : x
  2. Step 2: Convert to fraction form
    371.93/558.12 = 128.63/x
  3. Step 3: Cross multiply
    371.93x = 558.12 × 128.63
  4. Step 4: Simplify right side
    371.93x = 71,788.19
  5. Step 5: Solve for x
    x = 71,788.19/371.93
  6. Step 6: Final answer
    x = 193.02

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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.