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Finding the Fourth Proportional to 310.72, 429.02 and 248.90

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Solution

The fourth proportional to 310.72, 429.02 and 248.90 is: 343.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.72 : 429.02 = 248.90 : x
  2. Step 2: Convert to fraction form
    310.72/429.02 = 248.90/x
  3. Step 3: Cross multiply
    310.72x = 429.02 × 248.90
  4. Step 4: Simplify right side
    310.72x = 106,783.08
  5. Step 5: Solve for x
    x = 106,783.08/310.72
  6. Step 6: Final answer
    x = 343.66

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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.