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Finding the Fourth Proportional to 309.48, 426 and 280.32

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Solution

The fourth proportional to 309.48, 426 and 280.32 is: 385.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.48 : 426 = 280.32 : x
  2. Step 2: Convert to fraction form
    309.48/426 = 280.32/x
  3. Step 3: Cross multiply
    309.48x = 426 × 280.32
  4. Step 4: Simplify right side
    309.48x = 119,416.32
  5. Step 5: Solve for x
    x = 119,416.32/309.48
  6. Step 6: Final answer
    x = 385.86

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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.