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Finding the Fourth Proportional to 309.28, 424.70 and 276.52

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Solution

The fourth proportional to 309.28, 424.70 and 276.52 is: 379.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.28 : 424.70 = 276.52 : x
  2. Step 2: Convert to fraction form
    309.28/424.70 = 276.52/x
  3. Step 3: Cross multiply
    309.28x = 424.70 × 276.52
  4. Step 4: Simplify right side
    309.28x = 117,438.04
  5. Step 5: Solve for x
    x = 117,438.04/309.28
  6. Step 6: Final answer
    x = 379.71

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.