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Finding the Fourth Proportional to 309.84, 426.22 and 272.32

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Solution

The fourth proportional to 309.84, 426.22 and 272.32 is: 374.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.84 : 426.22 = 272.32 : x
  2. Step 2: Convert to fraction form
    309.84/426.22 = 272.32/x
  3. Step 3: Cross multiply
    309.84x = 426.22 × 272.32
  4. Step 4: Simplify right side
    309.84x = 116,068.23
  5. Step 5: Solve for x
    x = 116,068.23/309.84
  6. Step 6: Final answer
    x = 374.61

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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.