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Finding the Fourth Proportional to 12.55, 17.31 and 8.45

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Solution

The fourth proportional to 12.55, 17.31 and 8.45 is: 11.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.55 : 17.31 = 8.45 : x
  2. Step 2: Convert to fraction form
    12.55/17.31 = 8.45/x
  3. Step 3: Cross multiply
    12.55x = 17.31 × 8.45
  4. Step 4: Simplify right side
    12.55x = 146.23
  5. Step 5: Solve for x
    x = 146.23/12.55
  6. Step 6: Final answer
    x = 11.66

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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.