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Finding the Fourth Proportional to 308.46, 425.78 and 190.45

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Solution

The fourth proportional to 308.46, 425.78 and 190.45 is: 262.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.46 : 425.78 = 190.45 : x
  2. Step 2: Convert to fraction form
    308.46/425.78 = 190.45/x
  3. Step 3: Cross multiply
    308.46x = 425.78 × 190.45
  4. Step 4: Simplify right side
    308.46x = 81,090.63
  5. Step 5: Solve for x
    x = 81,090.63/308.46
  6. Step 6: Final answer
    x = 262.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.