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Finding the Fourth Proportional to 19.05, 28.50 and 15.40

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Solution

The fourth proportional to 19.05, 28.50 and 15.40 is: 23.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.05 : 28.50 = 15.40 : x
  2. Step 2: Convert to fraction form
    19.05/28.50 = 15.40/x
  3. Step 3: Cross multiply
    19.05x = 28.50 × 15.40
  4. Step 4: Simplify right side
    19.05x = 438.90
  5. Step 5: Solve for x
    x = 438.90/19.05
  6. Step 6: Final answer
    x = 23.04

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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.