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Finding the Fourth Proportional to 310.31, 428.19 and 186

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Solution

The fourth proportional to 310.31, 428.19 and 186 is: 256.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.31 : 428.19 = 186 : x
  2. Step 2: Convert to fraction form
    310.31/428.19 = 186/x
  3. Step 3: Cross multiply
    310.31x = 428.19 × 186
  4. Step 4: Simplify right side
    310.31x = 79,643.34
  5. Step 5: Solve for x
    x = 79,643.34/310.31
  6. Step 6: Final answer
    x = 256.66

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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.