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Finding the Fourth Proportional to 12.55, 17.31 and 9.47

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Solution

The fourth proportional to 12.55, 17.31 and 9.47 is: 13.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.55 : 17.31 = 9.47 : x
  2. Step 2: Convert to fraction form
    12.55/17.31 = 9.47/x
  3. Step 3: Cross multiply
    12.55x = 17.31 × 9.47
  4. Step 4: Simplify right side
    12.55x = 164.02
  5. Step 5: Solve for x
    x = 164.02/12.55
  6. Step 6: Final answer
    x = 13.07

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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.