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Finding the Fourth Proportional to 309.53, 464.70 and 218.27

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Solution

The fourth proportional to 309.53, 464.70 and 218.27 is: 327.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.53 : 464.70 = 218.27 : x
  2. Step 2: Convert to fraction form
    309.53/464.70 = 218.27/x
  3. Step 3: Cross multiply
    309.53x = 464.70 × 218.27
  4. Step 4: Simplify right side
    309.53x = 101,430.07
  5. Step 5: Solve for x
    x = 101,430.07/309.53
  6. Step 6: Final answer
    x = 327.69

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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.