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Finding the Fourth Proportional to 308.17, 424.78 and 245.89

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Solution

The fourth proportional to 308.17, 424.78 and 245.89 is: 338.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.17 : 424.78 = 245.89 : x
  2. Step 2: Convert to fraction form
    308.17/424.78 = 245.89/x
  3. Step 3: Cross multiply
    308.17x = 424.78 × 245.89
  4. Step 4: Simplify right side
    308.17x = 104,449.15
  5. Step 5: Solve for x
    x = 104,449.15/308.17
  6. Step 6: Final answer
    x = 338.93

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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.