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Finding the Fourth Proportional to 19.17, 28.75 and 12.45

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Solution

The fourth proportional to 19.17, 28.75 and 12.45 is: 18.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.17 : 28.75 = 12.45 : x
  2. Step 2: Convert to fraction form
    19.17/28.75 = 12.45/x
  3. Step 3: Cross multiply
    19.17x = 28.75 × 12.45
  4. Step 4: Simplify right side
    19.17x = 357.91
  5. Step 5: Solve for x
    x = 357.91/19.17
  6. Step 6: Final answer
    x = 18.67

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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.