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Finding the Fourth Proportional to 323.18, 484.69 and 128.12

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Solution

The fourth proportional to 323.18, 484.69 and 128.12 is: 192.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.18 : 484.69 = 128.12 : x
  2. Step 2: Convert to fraction form
    323.18/484.69 = 128.12/x
  3. Step 3: Cross multiply
    323.18x = 484.69 × 128.12
  4. Step 4: Simplify right side
    323.18x = 62,097.84
  5. Step 5: Solve for x
    x = 62,097.84/323.18
  6. Step 6: Final answer
    x = 192.15

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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.