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Finding the Fourth Proportional to 310.77, 428.79 and 186.38

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Solution

The fourth proportional to 310.77, 428.79 and 186.38 is: 257.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.77 : 428.79 = 186.38 : x
  2. Step 2: Convert to fraction form
    310.77/428.79 = 186.38/x
  3. Step 3: Cross multiply
    310.77x = 428.79 × 186.38
  4. Step 4: Simplify right side
    310.77x = 79,917.34
  5. Step 5: Solve for x
    x = 79,917.34/310.77
  6. Step 6: Final answer
    x = 257.16

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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.