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Finding the Fourth Proportional to 43.45, 65.18 and 11.39

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Solution

The fourth proportional to 43.45, 65.18 and 11.39 is: 17.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.45 : 65.18 = 11.39 : x
  2. Step 2: Convert to fraction form
    43.45/65.18 = 11.39/x
  3. Step 3: Cross multiply
    43.45x = 65.18 × 11.39
  4. Step 4: Simplify right side
    43.45x = 742.44
  5. Step 5: Solve for x
    x = 742.44/43.45
  6. Step 6: Final answer
    x = 17.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.