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Finding the Fourth Proportional to 310.92, 429 and 178.11

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Solution

The fourth proportional to 310.92, 429 and 178.11 is: 245.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.92 : 429 = 178.11 : x
  2. Step 2: Convert to fraction form
    310.92/429 = 178.11/x
  3. Step 3: Cross multiply
    310.92x = 429 × 178.11
  4. Step 4: Simplify right side
    310.92x = 76,409.19
  5. Step 5: Solve for x
    x = 76,409.19/310.92
  6. Step 6: Final answer
    x = 245.75

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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.