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Finding the Fourth Proportional to 13.56, 18.47 and 13.45

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Solution

The fourth proportional to 13.56, 18.47 and 13.45 is: 18.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.56 : 18.47 = 13.45 : x
  2. Step 2: Convert to fraction form
    13.56/18.47 = 13.45/x
  3. Step 3: Cross multiply
    13.56x = 18.47 × 13.45
  4. Step 4: Simplify right side
    13.56x = 248.42
  5. Step 5: Solve for x
    x = 248.42/13.56
  6. Step 6: Final answer
    x = 18.32

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.