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Finding the Fourth Proportional to 309.75, 464.76 and 228.21

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Solution

The fourth proportional to 309.75, 464.76 and 228.21 is: 342.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.75 : 464.76 = 228.21 : x
  2. Step 2: Convert to fraction form
    309.75/464.76 = 228.21/x
  3. Step 3: Cross multiply
    309.75x = 464.76 × 228.21
  4. Step 4: Simplify right side
    309.75x = 106,062.88
  5. Step 5: Solve for x
    x = 106,062.88/309.75
  6. Step 6: Final answer
    x = 342.41

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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.