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Finding the Fourth Proportional to 310.79, 428.87 and 179.84

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Solution

The fourth proportional to 310.79, 428.87 and 179.84 is: 248.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.79 : 428.87 = 179.84 : x
  2. Step 2: Convert to fraction form
    310.79/428.87 = 179.84/x
  3. Step 3: Cross multiply
    310.79x = 428.87 × 179.84
  4. Step 4: Simplify right side
    310.79x = 77,127.98
  5. Step 5: Solve for x
    x = 77,127.98/310.79
  6. Step 6: Final answer
    x = 248.17

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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.