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Finding the Fourth Proportional to 310.70, 428.86 and 179.80

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Solution

The fourth proportional to 310.70, 428.86 and 179.80 is: 248.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.70 : 428.86 = 179.80 : x
  2. Step 2: Convert to fraction form
    310.70/428.86 = 179.80/x
  3. Step 3: Cross multiply
    310.70x = 428.86 × 179.80
  4. Step 4: Simplify right side
    310.70x = 77,109.03
  5. Step 5: Solve for x
    x = 77,109.03/310.70
  6. Step 6: Final answer
    x = 248.18

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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.