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Finding the Fourth Proportional to 309.76, 464.90 and 163.68

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Solution

The fourth proportional to 309.76, 464.90 and 163.68 is: 245.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.76 : 464.90 = 163.68 : x
  2. Step 2: Convert to fraction form
    309.76/464.90 = 163.68/x
  3. Step 3: Cross multiply
    309.76x = 464.90 × 163.68
  4. Step 4: Simplify right side
    309.76x = 76,094.83
  5. Step 5: Solve for x
    x = 76,094.83/309.76
  6. Step 6: Final answer
    x = 245.66

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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.