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Finding the Fourth Proportional to 310.49, 428.47 and 170.61

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Solution

The fourth proportional to 310.49, 428.47 and 170.61 is: 235.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.49 : 428.47 = 170.61 : x
  2. Step 2: Convert to fraction form
    310.49/428.47 = 170.61/x
  3. Step 3: Cross multiply
    310.49x = 428.47 × 170.61
  4. Step 4: Simplify right side
    310.49x = 73,101.27
  5. Step 5: Solve for x
    x = 73,101.27/310.49
  6. Step 6: Final answer
    x = 235.44

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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.