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Finding the Fourth Proportional to 250.35, 375.30 and 128.55

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Solution

The fourth proportional to 250.35, 375.30 and 128.55 is: 192.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.35 : 375.30 = 128.55 : x
  2. Step 2: Convert to fraction form
    250.35/375.30 = 128.55/x
  3. Step 3: Cross multiply
    250.35x = 375.30 × 128.55
  4. Step 4: Simplify right side
    250.35x = 48,244.82
  5. Step 5: Solve for x
    x = 48,244.82/250.35
  6. Step 6: Final answer
    x = 192.71

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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.