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Finding the Fourth Proportional to 309.44, 426.96 and 285.12

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Solution

The fourth proportional to 309.44, 426.96 and 285.12 is: 393.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.44 : 426.96 = 285.12 : x
  2. Step 2: Convert to fraction form
    309.44/426.96 = 285.12/x
  3. Step 3: Cross multiply
    309.44x = 426.96 × 285.12
  4. Step 4: Simplify right side
    309.44x = 121,734.84
  5. Step 5: Solve for x
    x = 121,734.84/309.44
  6. Step 6: Final answer
    x = 393.40

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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.