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Finding the Fourth Proportional to 18.89, 28.30 and 13.20

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Solution

The fourth proportional to 18.89, 28.30 and 13.20 is: 19.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.89 : 28.30 = 13.20 : x
  2. Step 2: Convert to fraction form
    18.89/28.30 = 13.20/x
  3. Step 3: Cross multiply
    18.89x = 28.30 × 13.20
  4. Step 4: Simplify right side
    18.89x = 373.42
  5. Step 5: Solve for x
    x = 373.42/18.89
  6. Step 6: Final answer
    x = 19.77

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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.