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Finding the Fourth Proportional to 12.75, 17.60 and 7

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Solution

The fourth proportional to 12.75, 17.60 and 7 is: 9.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.75 : 17.60 = 7 : x
  2. Step 2: Convert to fraction form
    12.75/17.60 = 7/x
  3. Step 3: Cross multiply
    12.75x = 17.60 × 7
  4. Step 4: Simplify right side
    12.75x = 123.17
  5. Step 5: Solve for x
    x = 123.17/12.75
  6. Step 6: Final answer
    x = 9.66

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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.