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Finding the Fourth Proportional to 372.42, 558.62 and 128.96

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Solution

The fourth proportional to 372.42, 558.62 and 128.96 is: 193.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.42 : 558.62 = 128.96 : x
  2. Step 2: Convert to fraction form
    372.42/558.62 = 128.96/x
  3. Step 3: Cross multiply
    372.42x = 558.62 × 128.96
  4. Step 4: Simplify right side
    372.42x = 72,039.64
  5. Step 5: Solve for x
    x = 72,039.64/372.42
  6. Step 6: Final answer
    x = 193.44

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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.