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Finding the Fourth Proportional to 309.84, 464.28 and 172.68

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Solution

The fourth proportional to 309.84, 464.28 and 172.68 is: 258.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.84 : 464.28 = 172.68 : x
  2. Step 2: Convert to fraction form
    309.84/464.28 = 172.68/x
  3. Step 3: Cross multiply
    309.84x = 464.28 × 172.68
  4. Step 4: Simplify right side
    309.84x = 80,171.87
  5. Step 5: Solve for x
    x = 80,171.87/309.84
  6. Step 6: Final answer
    x = 258.75

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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.