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Finding the Fourth Proportional to 309.22, 464.16 and 172.34

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Solution

The fourth proportional to 309.22, 464.16 and 172.34 is: 258.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.22 : 464.16 = 172.34 : x
  2. Step 2: Convert to fraction form
    309.22/464.16 = 172.34/x
  3. Step 3: Cross multiply
    309.22x = 464.16 × 172.34
  4. Step 4: Simplify right side
    309.22x = 79,993.33
  5. Step 5: Solve for x
    x = 79,993.33/309.22
  6. Step 6: Final answer
    x = 258.69

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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.