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Finding the Fourth Proportional to 309.44, 464.16 and 138.56

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Solution

The fourth proportional to 309.44, 464.16 and 138.56 is: 207.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.44 : 464.16 = 138.56 : x
  2. Step 2: Convert to fraction form
    309.44/464.16 = 138.56/x
  3. Step 3: Cross multiply
    309.44x = 464.16 × 138.56
  4. Step 4: Simplify right side
    309.44x = 64,314.01
  5. Step 5: Solve for x
    x = 64,314.01/309.44
  6. Step 6: Final answer
    x = 207.84

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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.