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Finding the Fourth Proportional to 250.15, 375.45 and 128.49

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Solution

The fourth proportional to 250.15, 375.45 and 128.49 is: 192.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.15 : 375.45 = 128.49 : x
  2. Step 2: Convert to fraction form
    250.15/375.45 = 128.49/x
  3. Step 3: Cross multiply
    250.15x = 375.45 × 128.49
  4. Step 4: Simplify right side
    250.15x = 48,241.57
  5. Step 5: Solve for x
    x = 48,241.57/250.15
  6. Step 6: Final answer
    x = 192.85

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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.