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Finding the Fourth Proportional to 192.53, 265.70 and 105.21

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Solution

The fourth proportional to 192.53, 265.70 and 105.21 is: 145.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.53 : 265.70 = 105.21 : x
  2. Step 2: Convert to fraction form
    192.53/265.70 = 105.21/x
  3. Step 3: Cross multiply
    192.53x = 265.70 × 105.21
  4. Step 4: Simplify right side
    192.53x = 27,952.44
  5. Step 5: Solve for x
    x = 27,952.44/192.53
  6. Step 6: Final answer
    x = 145.18

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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.