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Finding the Fourth Proportional to 12, 17.91 and 10.56

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Solution

The fourth proportional to 12, 17.91 and 10.56 is: 15.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12 : 17.91 = 10.56 : x
  2. Step 2: Convert to fraction form
    12/17.91 = 10.56/x
  3. Step 3: Cross multiply
    12x = 17.91 × 10.56
  4. Step 4: Simplify right side
    12x = 189.13
  5. Step 5: Solve for x
    x = 189.13/12
  6. Step 6: Final answer
    x = 15.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.