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Finding the Fourth Proportional to 12.58, 17.39 and 11.31

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Solution

The fourth proportional to 12.58, 17.39 and 11.31 is: 15.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.58 : 17.39 = 11.31 : x
  2. Step 2: Convert to fraction form
    12.58/17.39 = 11.31/x
  3. Step 3: Cross multiply
    12.58x = 17.39 × 11.31
  4. Step 4: Simplify right side
    12.58x = 196.76
  5. Step 5: Solve for x
    x = 196.76/12.58
  6. Step 6: Final answer
    x = 15.64

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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.