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Finding the Fourth Proportional to 310.69, 428.55 and 236.84

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Solution

The fourth proportional to 310.69, 428.55 and 236.84 is: 326.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.69 : 428.55 = 236.84 : x
  2. Step 2: Convert to fraction form
    310.69/428.55 = 236.84/x
  3. Step 3: Cross multiply
    310.69x = 428.55 × 236.84
  4. Step 4: Simplify right side
    310.69x = 101,497.78
  5. Step 5: Solve for x
    x = 101,497.78/310.69
  6. Step 6: Final answer
    x = 326.69

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.