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Finding the Fourth Proportional to 310.27, 428.21 and 186

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Solution

The fourth proportional to 310.27, 428.21 and 186 is: 256.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.27 : 428.21 = 186 : x
  2. Step 2: Convert to fraction form
    310.27/428.21 = 186/x
  3. Step 3: Cross multiply
    310.27x = 428.21 × 186
  4. Step 4: Simplify right side
    310.27x = 79,647.06
  5. Step 5: Solve for x
    x = 79,647.06/310.27
  6. Step 6: Final answer
    x = 256.70

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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.