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Finding the Fourth Proportional to 192.31, 265.45 and 123.31

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Solution

The fourth proportional to 192.31, 265.45 and 123.31 is: 170.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.31 : 265.45 = 123.31 : x
  2. Step 2: Convert to fraction form
    192.31/265.45 = 123.31/x
  3. Step 3: Cross multiply
    192.31x = 265.45 × 123.31
  4. Step 4: Simplify right side
    192.31x = 32,732.64
  5. Step 5: Solve for x
    x = 32,732.64/192.31
  6. Step 6: Final answer
    x = 170.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.