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Finding the Fourth Proportional to 12.85, 17.70 and 12.51

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Solution

The fourth proportional to 12.85, 17.70 and 12.51 is: 17.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.85 : 17.70 = 12.51 : x
  2. Step 2: Convert to fraction form
    12.85/17.70 = 12.51/x
  3. Step 3: Cross multiply
    12.85x = 17.70 × 12.51
  4. Step 4: Simplify right side
    12.85x = 221.43
  5. Step 5: Solve for x
    x = 221.43/12.85
  6. Step 6: Final answer
    x = 17.23

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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.