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Finding the Fourth Proportional to 12.34, 18.54 and 11.65

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Solution

The fourth proportional to 12.34, 18.54 and 11.65 is: 17.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.34 : 18.54 = 11.65 : x
  2. Step 2: Convert to fraction form
    12.34/18.54 = 11.65/x
  3. Step 3: Cross multiply
    12.34x = 18.54 × 11.65
  4. Step 4: Simplify right side
    12.34x = 215.99
  5. Step 5: Solve for x
    x = 215.99/12.34
  6. Step 6: Final answer
    x = 17.50

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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.