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Finding the Fourth Proportional to 309.31, 425.76 and 269.90

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Solution

The fourth proportional to 309.31, 425.76 and 269.90 is: 371.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.31 : 425.76 = 269.90 : x
  2. Step 2: Convert to fraction form
    309.31/425.76 = 269.90/x
  3. Step 3: Cross multiply
    309.31x = 425.76 × 269.90
  4. Step 4: Simplify right side
    309.31x = 114,913.40
  5. Step 5: Solve for x
    x = 114,913.40/309.31
  6. Step 6: Final answer
    x = 371.51

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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.