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Finding the Fourth Proportional to 310.59, 428.46 and 186.19

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Solution

The fourth proportional to 310.59, 428.46 and 186.19 is: 256.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.59 : 428.46 = 186.19 : x
  2. Step 2: Convert to fraction form
    310.59/428.46 = 186.19/x
  3. Step 3: Cross multiply
    310.59x = 428.46 × 186.19
  4. Step 4: Simplify right side
    310.59x = 79,774.97
  5. Step 5: Solve for x
    x = 79,774.97/310.59
  6. Step 6: Final answer
    x = 256.85

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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.