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Finding the Fourth Proportional to 18.89, 26.10 and 12.77

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Solution

The fourth proportional to 18.89, 26.10 and 12.77 is: 17.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.89 : 26.10 = 12.77 : x
  2. Step 2: Convert to fraction form
    18.89/26.10 = 12.77/x
  3. Step 3: Cross multiply
    18.89x = 26.10 × 12.77
  4. Step 4: Simplify right side
    18.89x = 333.17
  5. Step 5: Solve for x
    x = 333.17/18.89
  6. Step 6: Final answer
    x = 17.64

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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.