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Finding the Fourth Proportional to 309.76, 465.28 and 255.84

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Solution

The fourth proportional to 309.76, 465.28 and 255.84 is: 384.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.76 : 465.28 = 255.84 : x
  2. Step 2: Convert to fraction form
    309.76/465.28 = 255.84/x
  3. Step 3: Cross multiply
    309.76x = 465.28 × 255.84
  4. Step 4: Simplify right side
    309.76x = 119,037.24
  5. Step 5: Solve for x
    x = 119,037.24/309.76
  6. Step 6: Final answer
    x = 384.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.