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Finding the Fourth Proportional to 323.63, 485.18 and 128.51

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Solution

The fourth proportional to 323.63, 485.18 and 128.51 is: 192.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.63 : 485.18 = 128.51 : x
  2. Step 2: Convert to fraction form
    323.63/485.18 = 128.51/x
  3. Step 3: Cross multiply
    323.63x = 485.18 × 128.51
  4. Step 4: Simplify right side
    323.63x = 62,351.08
  5. Step 5: Solve for x
    x = 62,351.08/323.63
  6. Step 6: Final answer
    x = 192.66

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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.