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Finding the Fourth Proportional to 310.98, 427.89 and 269.40

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Solution

The fourth proportional to 310.98, 427.89 and 269.40 is: 370.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.98 : 427.89 = 269.40 : x
  2. Step 2: Convert to fraction form
    310.98/427.89 = 269.40/x
  3. Step 3: Cross multiply
    310.98x = 427.89 × 269.40
  4. Step 4: Simplify right side
    310.98x = 115,273.57
  5. Step 5: Solve for x
    x = 115,273.57/310.98
  6. Step 6: Final answer
    x = 370.68

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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.