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Finding the Fourth Proportional to 309.40, 426.91 and 225.52

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Solution

The fourth proportional to 309.40, 426.91 and 225.52 is: 311.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.40 : 426.91 = 225.52 : x
  2. Step 2: Convert to fraction form
    309.40/426.91 = 225.52/x
  3. Step 3: Cross multiply
    309.40x = 426.91 × 225.52
  4. Step 4: Simplify right side
    309.40x = 96,276.17
  5. Step 5: Solve for x
    x = 96,276.17/309.40
  6. Step 6: Final answer
    x = 311.17

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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.