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Finding the Fourth Proportional to 310.79, 428.94 and 186.41

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Solution

The fourth proportional to 310.79, 428.94 and 186.41 is: 257.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.79 : 428.94 = 186.41 : x
  2. Step 2: Convert to fraction form
    310.79/428.94 = 186.41/x
  3. Step 3: Cross multiply
    310.79x = 428.94 × 186.41
  4. Step 4: Simplify right side
    310.79x = 79,958.71
  5. Step 5: Solve for x
    x = 79,958.71/310.79
  6. Step 6: Final answer
    x = 257.28

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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.