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Finding the Fourth Proportional to 19.33, 28.97 and 7.90

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Solution

The fourth proportional to 19.33, 28.97 and 7.90 is: 11.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.33 : 28.97 = 7.90 : x
  2. Step 2: Convert to fraction form
    19.33/28.97 = 7.90/x
  3. Step 3: Cross multiply
    19.33x = 28.97 × 7.90
  4. Step 4: Simplify right side
    19.33x = 228.79
  5. Step 5: Solve for x
    x = 228.79/19.33
  6. Step 6: Final answer
    x = 11.84

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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.