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Finding the Fourth Proportional to 309.49, 426.70 and 260.26

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Solution

The fourth proportional to 309.49, 426.70 and 260.26 is: 358.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.49 : 426.70 = 260.26 : x
  2. Step 2: Convert to fraction form
    309.49/426.70 = 260.26/x
  3. Step 3: Cross multiply
    309.49x = 426.70 × 260.26
  4. Step 4: Simplify right side
    309.49x = 111,052.94
  5. Step 5: Solve for x
    x = 111,052.94/309.49
  6. Step 6: Final answer
    x = 358.83

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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.